move _GNU_SOURCE to the main makefile

A bunch of utils are relying on _GNU_SOURCE already.  The new prompt code
uses getline() which is now part of POSIX, but in older versions of glibc,
it was behind _GNU_SOURCE as it was a GNU extension.

This change doesn't actually tie us to glibc.  Only code that uses GNU
extensions does that.  It just kills warning when using older versions of
glibc.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

1 files changed, 0 insertions, 1 deletions

diff --git a/nandtest.c b/nandtest.c
index 0187b87..3437b57 100644
--- a/nandtest.c
+++ b/nandtest.c
@@ -1,6 +1,5 @@
 #define PROGRAM_NAME "nandtest"
 
-#define _GNU_SOURCE
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>