[gnome-software] build: Enable C99 support in meson.build

[Philip Withnall <pwithnall src gnome org>]

commit ecf5e47a148ef3b253787f979581b75d3e8eaf3d
Author: Philip Withnall <withnall endlessm com>
Date:   Wed Aug 16 13:22:38 2017 +0100

    build: Enable C99 support in meson.build
    
    We use C99 features (gs-app.c), so need to explicitly enable them in
    meson.build, as some compilers will not enable them automatically, and
    will instead error when they encounter usage of C99.
    
    Signed-off-by: Philip Withnall <withnall endlessm com>
    
    https://bugzilla.gnome.org/show_bug.cgi?id=786368

 meson.build |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/meson.build b/meson.build
index 40ab6b1..473762f 100644
--- a/meson.build
+++ b/meson.build
@@ -1,7 +1,7 @@
 project('gnome-software', 'c',
   version : '3.25.90',
   license : 'GPL-2.0+',
-  default_options : ['warning_level=1'],
+  default_options : ['warning_level=1', 'c_std=c99'],
   meson_version : '>=0.37.0'
 )