BUG: Cannot create shared object for Android x86_64

When compiling and linking for Android x86_64, the linking of the
shared object libmp3lame.so.0.0.0 fails.

--sysroot was used to pass the header and library paths. --sysroot was
set in CPPFLAGS, CFLAGS and CXXFLAGS:

$ echo $CPPFLAGS
--sysroot=/opt/android-ndk-r10d/platforms/android-21/arch-x86_64
$ echo $CFLAGS
--sysroot=/opt/android-ndk-r10d/platforms/android-21/arch-x86_64
$ echo $CXXFLAGS
--sysroot=/opt/android-ndk-r10d/platforms/android-21/arch-x86_64

--sysroot was used during configuration and compilation, and all the
object files were created successfully.

--sysroot was not present when creating the shared object, and the
shared object creation failed.

The invocation below needs to include CFLAGS so --sysroot is available
to the compiler driver.

**********

$ echo $ANDROID_SYSROOT
/opt/android-ndk-r10d/platforms/android-21/arch-x86_64
$ ls $ANDROID_SYSROOT/usr/lib
crtbegin_dynamic.o    libGLESv3.so        liblog.so
crtbegin_so.o        libOpenMAXAL.so        libm.a
crtbegin_static.o    libOpenSLES.so        libm.so
crtend_android.o    libandroid.so        libmediandk.so
crtend_so.o        libc.a            libstdc++.a
libEGL.so        libc.so            libstdc++.so
libGLESv1_CM.so        libdl.so        libz.a
libGLESv2.so        libjnigraphics.so    libz.so

**********

libtool: link: x86_64-linux-android-gcc -shared  .libs/VbrTag.o
.libs/bitstream.o .libs/encoder.o .libs/fft.o .libs/gain_analysis.o
.libs/id3tag.o .libs/lame.o .libs/newmdct.o .libs/presets.o
.libs/psymodel.o .libs/quantize.o .libs/quantize_pvt.o
.libs/reservoir.o .libs/set_get.o .libs/tables.o .libs/takehiro.o
.libs/util.o .libs/vbrquantize.o .libs/version.o
.libs/mpglib_interface.o  -Wl,--whole-archive
../libmp3lame/vector/.libs/liblamevectorroutines.a
../mpglib/.libs/libmpgdecoder.a -Wl,--no-whole-archive  -lm
-Wl,-soname -Wl,libmp3lame.so.0 -o .libs/libmp3lame.so.0.0.0

/opt/android-ndk-r10d/toolchains/x86_64-4.9/prebuilt/darwin-x86_64/bin/../lib/gcc/x86_64-linux-android/4.9/../../../../x86_64-linux-android/bin/ld:
error: cannot open crtbegin_so.o: No such file or directory
/opt/android-ndk-r10d/toolchains/x86_64-4.9/prebuilt/darwin-x86_64/bin/../lib/gcc/x86_64-linux-android/4.9/../../../../x86_64-linux-android/bin/ld:
error: cannot open crtend_so.o: No such file or directory
/opt/android-ndk-r10d/toolchains/x86_64-4.9/prebuilt/darwin-x86_64/bin/../lib/gcc/x86_64-linux-android/4.9/../../../../x86_64-linux-android/bin/ld:
error: cannot find -lm
/opt/android-ndk-r10d/toolchains/x86_64-4.9/prebuilt/darwin-x86_64/bin/../lib/gcc/x86_64-linux-android/4.9/../../../../x86_64-linux-android/bin/ld:
error: cannot find -lc
/opt/android-ndk-r10d/toolchains/x86_64-4.9/prebuilt/darwin-x86_64/bin/../lib/gcc/x86_64-linux-android/4.9/../../../../x86_64-linux-android/bin/ld:
error: cannot find -ldl
collect2: error: ld returned 1 exit status
make[3]: *** [libmp3lame.la] Error 1
make[2]: *** [all-recursive] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2

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