bug#30120: 26.0.90; Building with X toolkit without toolkit scroll bars broken on release branch and master

[martin rudalics <rudalics@gmx.at>]

Building with an X toolkit without toolkit scroll bars currently fails
here as


CFLAGS='-O0 -g3' ../configure --with-gnutls=no --without-pop  --enable-gcc-warnings=warn-only --with-x-toolkit=lucid --without-toolkit-scroll-bars --enable-checking=yes --enable-check-lisp-object-type=yes
make -j2 WERROR_CFLAGS=


In file included from ./string.h:49:0,
                  from ../../lib/explicit_bzero.c:28:
./stddef.h:93:3: error: conflicting types for ‘max_align_t’
In file included from ./stddef.h:55:0,
                  from ./string.h:49,
                  from ../../lib/explicit_bzero.c:28:
/usr/lib/gcc/x86_64-linux-gnu/4.7/include/stddef.h:426:3: note: previous declaration of ‘max_align_t’ was here
make[1]: *** [explicit_bzero.o] Fehler 1
make[1]: *** Warte auf noch nicht beendete Prozesse...
In file included from ./unistd.h:56:0,
                  from ../../lib/fcntl.c:28:
./stddef.h:93:3: error: conflicting types for ‘max_align_t’
In file included from ./stddef.h:55:0,
                  from ./unistd.h:56,
                  from ../../lib/fcntl.c:28:
/usr/lib/gcc/x86_64-linux-gnu/4.7/include/stddef.h:426:3: note: previous declaration of ‘max_align_t’ was here
make[1]: *** [fcntl.o] Fehler 1
make[1]: Leaving directory `/home/martin/emacs-git/release/obj-lucid-no/lib'
make: *** [lib] Fehler 2


both on the release branch and on master.  A GTK build fails
in a similar way.

martin