[PATCH] hsakmt: allow building with gcc 4.x

[Bridgman, John]

The hsakmt code requires c99 support, however gcc 4.x defaults to
c89 while gcc 5 defaults to c11. Adding this macro provides c99
support on older gcc while not forcing gcc 5 back from c11 to c99.

Signed-off-by: John Bridgman <john.bridgman at amd.com>
---
 configure.ac | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configure.ac b/configure.ac
index b8e9bea..8f32cbb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -66,6 +66,7 @@ AC_CANONICAL_HOST
 AC_PROG_AWK
 test_CFLAGS=${CFLAGS+set} # We may override autoconf default CFLAGS.
 AC_PROG_CC
+AC_PROG_CC_STDC
 AC_PROG_INSTALL
 AC_PROG_LIBTOOL
 AC_PROG_MAKE_SET
-- 
1.9.1