Eina: remove warning when compiling with mingw-w64

git-svn-id: http://svn.enlightenment.org/svn/e/trunk/eina@67447 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33

diff --git a/src/lib/eina_prefix.c b/src/lib/eina_prefix.c
index 5b4b0c0..4bd6be0 100644 (file)
--- a/src/lib/eina_prefix.c
+++ b/src/lib/eina_prefix.c
@@ -31,7 +31,9 @@
 #ifdef HAVE_ALLOCA_H
 # include <alloca.h>
 #elif defined __GNUC__
-# define alloca __builtin_alloca
+# ifndef alloca
+#  define alloca __builtin_alloca
+# endif
 #elif defined _AIX
 # define alloca __alloca
 #elif defined _MSC_VER