[Bug build/34407] Unable to build gdb when $SHELL is non-POSIX fish

https://sourceware.org/bugzilla/show_bug.cgi?id=34407

--- Comment #2 from nyanpasu64 at tuta dot io ---
I was copying Arch's PKGBUILD and ran:

mkdir -p build && cd build
../configure \
        --prefix=/usr \
        --disable-nls \
        --enable-source-highlight \
        --enable-tui \
        --enable-targets=all \
        --enable-languages=all \
        --enable-multilib \
        --enable-interwork \
        --with-system-readline \
        --with-python=/usr/bin/python \
        --with-system-gdbinit=/etc/gdb/gdbinit
make -j$(nproc)

Looking in the configure script it seems CONFIG_SHELL is set at configure time?
I tried `CONFIG_SHELL=/bin/sh ../configure ...` and the same make command, but
got the same errors. If I run `make clean && CONFIG_SHELL=/bin/sh make -j8`, I
get the same outcome. I *could* set SHELL=/bin/sh make, but this seems like
something that could better be placed in the Makefiles.

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