libc/glibc: run ./configure in CONFIG_SHELL

Tremendously helps when running on at least Ubuntu, with dash as
the system shell (ie. /bin/sh points to dash).

Reported by a few people, of which:
leming, ccct and ccole on IRC

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
(transplanted from 30c89d1f74a4fee73517b4ed67e843be6885447e)

 #!/bin/sh

 # Needed for systems without gettext

 $* -xc -o /dev/null - > /dev/null 2>&1 << EOF

 #include <libintl.h>

 int main()

 {

 	gettext("");

 	return 0;

 }

 EOF

 if [ ! "$?" -eq "0"  ]; then

 	echo -DKBUILD_NO_NLS;

 fi