fix OSX/Clang optimized builds

not quite sure how -fomit-frame-pointer can make a difference with 64bit
builds, but it does crash on start in 
gdk_window_new -> .. -> [NSColor _controlColor] -> GetThemeImage
-> _NSAppKitThemeLock  with no other threads involved.

full backtrace: http://pastebin.com/FxsCMzSY

1 files changed, 1 insertions, 0 deletions

diff --git a/wscript b/wscript
index 5e9b30b6c6..63a7537bc6 100644
--- a/wscript
+++ b/wscript
@@ -124,6 +124,7 @@ compiler_flags_dictionaries['clang'] = clang_dict;
 
 clang_darwin_dict = compiler_flags_dictionaries['clang'].copy();
 clang_darwin_dict['cxx-strict'] = [ '-ansi', '-Wnon-virtual-dtor', '-Woverloaded-virtual', ]
+clang_darwin_dict['full-optimization'] = [ '-O3', '-ffast-math', '-fstrength-reduce' ]
 compiler_flags_dictionaries['clang-darwin'] = clang_darwin_dict;
 
 def fetch_git_revision ():