[gnome-boxes] meson: fix enable-debug Cflags

[Felipe Borges <felipeborges src gnome org>]

commit 59f0c1b9e905498c069f72fa817631135b8321a5
Author: Benoit Gschwind <gschwind gnu-log net>
Date:   Wed Nov 8 16:54:59 2017 +0100

    meson: fix enable-debug Cflags
    
    https://bugzilla.gnome.org/show_bug.cgi?id=790092

 src/meson.build |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/meson.build b/src/meson.build
index 108bacb..85b1abd 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -148,7 +148,7 @@ c_args = [
 ]
 
 if get_option ('enable-debug')
-  c_args += ['-00 -ggdb3']
+  c_args += ['-O0', '-ggdb3']
 endif
 
 if get_option ('enable-strict-cc')