build: fix make clean on OSX

Rebased-From: 74df0f5
Rebased-By: Wladimir J. van der Laan <[email protected]>

Author: theuni

Makefile.am

@@ -164,9 +164,9 @@ endif
 
 EXTRA_DIST = $(top_srcdir)/share/genbuild.sh qa/pull-tester/pull-tester.sh qa/rpc-tests $(DIST_DOCS) $(WINDOWS_PACKAGING) $(OSX_PACKAGING)
 
-CLEANFILES = $(OSX_DMG) $(OSX_APP) $(BITCOIN_WIN_INSTALLER)
+CLEANFILES = $(OSX_DMG) $(BITCOIN_WIN_INSTALLER)
 
 .INTERMEDIATE: $(COVERAGE_INFO)
 
 clean-local:
-	rm -rf test_bitcoin.coverage/ total.coverage/
+	rm -rf test_bitcoin.coverage/ total.coverage/ $(OSX_APP)