build: Run libdmg-hfsplus's DMG tool in make deploy

Previously, the compression of the .iso file to a .dmg file was done
outside of `make deploy' in order to use the faketime-wrapped version of
libdmg-hfsplus's DMG tool.

Specifying the faketime-wrapped version of the DMG tool to ./configure
fixes this and simplifies build scripts.

.gitignore

@@ -76,6 +76,7 @@ src/qt/bitcoin-qt.includes
 *.log
 *.trs
 *.dmg
+*.iso
 
 *.json.h
 *.raw.h