add 'getgrgid' to uClibc site config, needed after glib2 update in [11088]

SVN-Revision: 11093

include/site/linux-uclibc

@@ -22,6 +22,7 @@ ac_cv_func_malloc_0_nonnull=yes
 ac_cv_func_malloc_works=yes
 ac_cv_func_memcmp_clean=yes
 ac_cv_func_memcmp_working=yes
+ac_cv_func_posix_getgrgid_r=yes
 ac_cv_func_posix_getpwuid_r=yes
 ac_cv_func_pthread_key_delete=yes
 ac_cv_func_realloc_0_nonnull=yes