don't dist output dir

Author: Dan Wilcox

Makefile

@@ -36,7 +36,7 @@ mac.dist.version := $(shell /usr/libexec/PlistBuddy -c "Print :CFBundleShortVers
 mac.dist.include = bin/data CHANGES.txt LICENSE.txt README.md
 
 # remove these from the release dist package (relative to the dist dir)
-mac.dist.exclude = data/icon.icns data/icon-debug.icns
+mac.dist.exclude = data/icon.icns data/icon-debug.icns data/output
 
 # codesign identity, usually a Developer ID Application string
 # REPLACE this with your own or set it via the commandline: