[gnome-software] trivial: Require a C99 compiler

[Richard Hughes <rhughes src gnome org>]

commit 54e5654acbd45c4a50efea498d87520399efeab7
Author: Richard Hughes <richard hughsie com>
Date:   Thu Nov 24 20:04:18 2016 +0000

    trivial: Require a C99 compiler

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 9251152..4499bba 100644
--- a/configure.ac
+++ b/configure.ac
@@ -10,7 +10,7 @@ AC_CONFIG_MACRO_DIR([m4])
 # enable nice build output on automake1.11
 m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])
 
-AC_PROG_CC
+AC_PROG_CC_C99
 AC_PROG_INSTALL
 LT_INIT
 AM_PROG_CC_C_O