re PR libgomp/90527 (alloc.c:72:7: error: implicit declaration of function ‘posix_memalign’)

	PR libgomp/90527
	* alloc.c (_GNU_SOURCE): Define.

From-SVN: r271438

libgomp/ChangeLog

+2019-05-20  Jakub Jelinek  <jakub@redhat.com>
+
+	PR libgomp/90527
+	* alloc.c (_GNU_SOURCE): Define.
+
 2019-05-17  Thomas Schwinge  <thomas@codesourcery.com>
 
 	* acc_prof.h: New file.

libgomp/alloc.c

@@ -27,6 +27,7 @@
    places in the OpenMP API do not make any provision for failure, so in
    general we cannot allow memory allocation to fail.  */
 
+#define _GNU_SOURCE
 #include "libgomp.h"
 #include <stdlib.h>