mac build: tweaks to build fuse for 10.4 and 10.5

rather than trying to build a single .app with both 10.4 and 10.5 fuse
libraries embedded within it, for the time being, we're just going to
have independant 10.4 and 10.5 builds.

this provides a 10.5 _fusemodule.so, and build changes to copy the
appropriate versions of files for 10.4 or 10.5 from sub dirs of mac/
into the build tree before triggering py2app

mac/Makefile

@@ -6,6 +6,7 @@ all: build
 dist: build diskimage upload cleanup
 
 build:
+	rsync -avn $( sw_vers -productVersion | sed -e 's/^\(10\.[0-9]*\)\..*$/\1/' )/ ./
 	python setup.py py2app --no-chdir
 
 diskimage: