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.

Makefile.am

@@ -35,6 +35,7 @@ space := $(empty) $(empty)
 OSX_APP=Bitcoin-Qt.app
 OSX_VOLNAME = $(subst $(space),-,$(PACKAGE_NAME))
 OSX_DMG = $(OSX_VOLNAME).dmg
+OSX_TEMP_ISO = $(OSX_DMG:.dmg=).temp.iso
 OSX_BACKGROUND_SVG=background.svg
 OSX_BACKGROUND_IMAGE=background.tiff
 OSX_BACKGROUND_IMAGE_DPIS=36 72
@@ -135,9 +136,13 @@ $(APP_DIST_DIR)/Applications:
 
 $(APP_DIST_EXTRAS): $(APP_DIST_DIR)/$(OSX_APP)/Contents/MacOS/Bitcoin-Qt
 
-$(OSX_DMG): $(APP_DIST_EXTRAS)
+.INTERMEDIATE: $(OSX_TEMP_ISO)
+$(OSX_TEMP_ISO): $(APP_DIST_EXTRAS)
 	$(GENISOIMAGE) -no-cache-inodes -D -l -probe -V "$(OSX_VOLNAME)" -no-pad -r -dir-mode 0755 -apple -o $@ dist
 
+$(OSX_DMG): $(OSX_TEMP_ISO)
+	$(DMG) dmg "$<" "$@"
+
 dpi%.$(OSX_BACKGROUND_IMAGE): contrib/macdeploy/$(OSX_BACKGROUND_SVG)
 	sed 's/PACKAGE_NAME/$(PACKAGE_NAME)/' < "$<" | $(RSVG_CONVERT) -f png -d $* -p $* | $(IMAGEMAGICK_CONVERT) - $@
 OSX_BACKGROUND_IMAGE_DPIFILES := $(foreach dpi,$(OSX_BACKGROUND_IMAGE_DPIS),dpi$(dpi).$(OSX_BACKGROUND_IMAGE))