waf extension: there is a need to copy custom framework to ChronoShare.app/Content/Framework/ directory

Somehow, mac's linker adds @loader_path/../Frameworks/Sparkle.framework/Versions/A/Sparkle
instead of a reasonable absolute or relative path.  The supplied "patch"
forces Sparkle.framework be automatically copied to the right place if
necessary.

Change-Id: Id756ec2d75c7ac50b981d4cbe895c4a3388e606f
diff --git a/waf b/waf
index 4ae5a18..b780e61 100755
--- a/waf
+++ b/waf
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