[vim/vim] --enable-gui=gtk4 doesn't enable X11 feature despite --with-x (Issue #21072)

bagasme created an issue (vim/vim#21072)

### Steps to reproduce

* Configure vim with gtk4 GUI:

```
$ ./configure --prefix=${HOME}/.local/vim --with-features=huge \
  --enable-gpm --enable-acl --with-x=yes --enable-gui=gtk4 \
  --enable-multibyte --enable-cscope --enable-netbeans \
  --enable-perlinterp=dynamic --enable-python3interp=dynamic \
  --enable-tclinterp=dynamic --enable-canberra
```

### Expected behaviour

I'm compiling vim with gtk4 GUI (`--enable-gui=gtk4`). When I check `auto/config.log` output, I see that X11 is not enabled despite being configure with `--with-x=yes`:

```
...
configure:10474: checking --enable-gui argument
configure:10565: result: GTK 4.x GUI support
configure:10864: checking --disable-gtktest argument
configure:10876: result: gtk test enabled
configure:10902: checking for pkg-config gtk4
configure:10907: result: found
configure:10909: checking for GTK - version >= 4.10.0
configure:10921: result: yes; found version 4.22.4
...
```

Switching back to gtk3 (`--enable-gui=gtk3`), however, does enable X11:

```
...
configure:9187: checking --with-wayland argument
configure:9202: result: yes
configure:9214: checking for wayland
configure:9217: result: yes
configure:9253: checking for cairo
configure:9259: result: yes
configure:9274: checking for pango
configure:9280: result: yes
configure:9308: checking for xmkmf
configure:9347: result: no
configure:9353: checking for X
configure:9391: gcc -o conftest -g -O2  -Wl,-E -Wl,-rpath,/usr/lib/perl5/5.42/core_perl/CORE   -L/usr/local/lib conftest.c -lX11 -lnsl   >&5
configure:9391: $? = 0
configure:9581: result: libraries , headers 
configure:9687: gcc -o conftest -g -O2  -Wl,-E -Wl,-rpath,/usr/lib/perl5/5.42/core_perl/CORE   -L/usr/local/lib conftest.c -lnsl    -lX11 >&5
configure:9687: $? = 0
configure:9803: checking for gethostbyname
configure:9803: gcc -o conftest -g -O2  -Wl,-E -Wl,-rpath,/usr/lib/perl5/5.42/core_perl/CORE   -L/usr/local/lib conftest.c -lnsl   >&5
configure:9803: $? = 0
configure:9803: result: yes
configure:9917: checking for connect
configure:9917: gcc -o conftest -g -O2  -Wl,-E -Wl,-rpath,/usr/lib/perl5/5.42/core_perl/CORE   -L/usr/local/lib conftest.c -lnsl   >&5
configure:9917: $? = 0
configure:9917: result: yes
configure:9975: checking for remove
configure:9975: gcc -o conftest -g -O2  -Wl,-E -Wl,-rpath,/usr/lib/perl5/5.42/core_perl/CORE   -L/usr/local/lib conftest.c -lnsl   >&5
configure:9975: $? = 0
configure:9975: result: yes
configure:10033: checking for shmat
configure:10033: gcc -o conftest -g -O2  -Wl,-E -Wl,-rpath,/usr/lib/perl5/5.42/core_perl/CORE   -L/usr/local/lib conftest.c -lnsl   >&5
configure:10033: $? = 0
configure:10033: result: yes
configure:10100: checking for IceConnectionNumber in -lICE
configure:10129: gcc -o conftest -g -O2  -Wl,-E -Wl,-rpath,/usr/lib/perl5/5.42/core_perl/CORE   -L/usr/local/lib conftest.c -lICE  -lnsl   >&5
configure:10129: $? = 0
configure:10141: result: yes
configure:10183: checking if X11 header files can be found
configure:10199: gcc -c -g -O2    conftest.c >&5
configure:10199: $? = 0
configure:10201: result: yes
configure:10222: checking for _XdmcpAuthDoIt in -lXdmcp
configure:10251: gcc -o conftest -g -O2  -L -Wl,-E -Wl,-rpath,/usr/lib/perl5/5.42/core_perl/CORE   -L/usr/local/lib conftest.c -lXdmcp -lXt  -lSM -lICE -lX11  -lXdmcp -lnsl   >&5
configure:10251: $? = 0
configure:10263: result: yes
configure:10271: checking for IceOpenConnection in -lICE
configure:10300: gcc -o conftest -g -O2  -L -Wl,-E -Wl,-rpath,/usr/lib/perl5/5.42/core_perl/CORE   -L/usr/local/lib conftest.c -lICE  -lXdmcp -lnsl   >&5
configure:10300: $? = 0
configure:10312: result: yes
configure:10321: checking for XpmCreatePixmapFromData in -lXpm
configure:10350: gcc -o conftest -g -O2    -Wl,-E -Wl,-rpath,/usr/lib/perl5/5.42/core_perl/CORE   -L/usr/local/lib conftest.c -lXpm -lXt  -lSM -lICE -lXpm -lX11  -lXdmcp -lSM -lICE -lnsl   >&5
configure:10350: $? = 0
configure:10362: result: yes
configure:10370: checking if X11 header files implicitly declare return values
configure:10389: gcc -c -g -O2   -Werror  conftest.c >&5
configure:10389: $? = 0
configure:10391: result: no
configure:10429: checking size of wchar_t
configure:10435: gcc -o conftest -g -O2  -Wl,-E -Wl,-rpath,/usr/lib/perl5/5.42/core_perl/CORE   -L/usr/local/lib conftest.c -lnsl   >&5
configure:10435: $? = 0
configure:10435: ./conftest
configure:10435: $? = 0
configure:10452: result: 4
configure:10474: checking --enable-gui argument
configure:10562: result: GTK+ 3.x GUI support
configure:10681: checking --disable-gtktest argument
configure:10693: result: gtk test enabled
configure:10719: checking for pkg-config gtk+-3.0
configure:10724: result: found
configure:10726: checking for GTK - version >= 3.0.0
configure:10738: result: yes; found version 3.24.52
...
```

Full config.log:

* [for gtk3 build](https://github.com/user-attachments/files/31143812/gtk3.config.log.txt)
* [for gtk4 build](https://github.com/user-attachments/files/31143823/gtk4.config.log.txt)

### Version of Vim

9.2.958

### Environment

Operating system: Arch Linux

### Logs and stack traces

```shell
(see Expected Behaviour section)
```

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