Only exclude build/windows and build/macosx, not the app/ ones.

http://code.google.com/p/arduino/issues/detail?id=1011

Author: damellis

build/build.xml

@@ -574,8 +574,8 @@
 		  prefix="arduino-${version}" 
 		  excludes="**/*.tgz,
 			     **/*.bz2,
-			     **/macosx/,
-			     **/windows/,
+			     **/build/macosx/,
+			     **/build/windows/,
 			     **/work/,
 			     **/.git/,
 			     **/*.class"