with_glib2 is gone, remove it.

maint/mctest

@@ -39,7 +39,7 @@ make distcheck enable_largefile=no enable_nls=no with_vfs=no \
      with_screen=ncurses >test3.out 2>test3.err
 
 echo "Checking the configuration with experimental and rarely used options"
-make distcheck with_glib2=yes with_screen=mcslang with_termcap=yes \
+make distcheck with_screen=mcslang with_termcap=yes \
      with_mmap=no with_subshell=optional >test4.out 2>test4.err
 
 if test -x /usr/bin/rpmbuild; then