[gnome-builder] build: set enable_profiling=no when not provided

[Christian Hergert <chergert src gnome org>]

commit 1edcff5e79136f3d154207ec909dfa93110ff630
Author: Christian Hergert <christian hergert me>
Date:   Thu May 21 14:53:36 2015 -0700

    build: set enable_profiling=no when not provided

 configure.ac |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 3b263f7..1adb4b6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -339,7 +339,8 @@ AC_MSG_CHECKING([for --enable-profiling])
 AC_ARG_ENABLE(profiling,
               AC_HELP_STRING([--enable-profiling],
                              [turn on runtime instrumentation [default=no]]),
-              [enable_profiling=$enableval])
+              [enable_profiling=$enableval],
+             [enable_profiling=no])
 AS_IF([test "$enable_profiling" = "yes"],[
        ac_save_cflags="$CFLAGS"
        CFLAGS="$CFLAGS -pg"