Makefile: don't remove unrelated files

Contributers don't expect to have their working files deleted on 'make clean'.
This process should only remove files created by the build mechanisms included in
the repository.

Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>

Makefile

@@ -21,13 +21,10 @@ SHELL=/bin/bash
 
 clean:
 	-python setup.py clean --all
-	-rm -f `find . -name "*~"`
-	-rm -f `find . -name "*.tmp"`
 	-rm -f bin/offlineimapc
 	-rm -f `find . -name "*.pyc"`
 	-rm -f `find . -name "*.pygc"`
 	-rm -f `find . -name "*.class"`
-	-rm -f `find . -name "*.bak"`
 	-rm -f `find . -name ".cache*"`
 	-rm -f manpage.links manpage.refs
 	-find . -name auth -exec rm -vf {}/password {}/username \;