gl_POSIX_FALLOCATE: rename to POSIX_FALLOCATE.

Remove the gl_ prefix because this macro isn't from Gnulib.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>

m4.include/mc-get-fs-info.m4

@@ -3,7 +3,7 @@ dnl
 dnl posix_allocate() function detection
 dnl
 
-AC_DEFUN([gl_POSIX_FALLOCATE], [
+AC_DEFUN([POSIX_FALLOCATE], [
     dnl * Old glibcs have broken posix_fallocate(). Make sure not to use it.
     AC_LINK_IFELSE([AC_LANG_PROGRAM([[
         #define _XOPEN_SOURCE 600
@@ -116,7 +116,7 @@ AC_DEFUN([mc_GET_FS_INFO], [
     fi
     gl_FSTYPENAME
 
-    gl_POSIX_FALLOCATE
+    POSIX_FALLOCATE
 
     mc_cu_PREREQ_STAT_PROG
 ])