8001965: build-infra: Large compare diffs between new and old on mac

Summary: The wrong icon source file was used when building closed
Reviewed-by: ohair, tbell
Contributed-by: erik.joelsson@oracle.com

makefiles/GensrcIcons.gmk

@@ -109,13 +109,17 @@ $(foreach I,$(GENSRC_X11_ICONS_SRC), $(eval $(call SetupGensrcX11Icon,$(notdir $
 
 ifeq ($(OPENJDK_TARGET_OS),macosx)
 
-  GENSRC_OSX_ICONS      = $(GENSRC_OSX_ICONS_DST)/AWTIconData.h
-  GENSRC_OSX_ICONS_SRC  =
-  GENSRC_OSX_ICONS_TMP  = $(JDK_OUTPUTDIR)/gensrc
-  GENSRC_OSX_ICONS_DST  = $(GENSRC_OSX_ICONS_TMP)/sun/osxapp
-  
-$(GENSRC_OSX_ICONS_DST)/AWTIconData.h: \
-    $(JDK_TOPDIR)/src/macosx/native/sun/osxapp/resource/icons/JavaApp.icns 
+  GENSRC_OSX_ICONS_TMP  := $(JDK_OUTPUTDIR)/gensrc
+  GENSRC_OSX_ICONS_DST  := $(GENSRC_OSX_ICONS_TMP)/sun/osxapp
+  GENSRC_OSX_ICONS      := $(GENSRC_OSX_ICONS_DST)/AWTIconData.h
+
+  ifdef OPENJDK
+    GENSRC_OSX_ICONS_SRC := $(JDK_TOPDIR)/src/macosx/native/sun/osxapp/resource/icons/JavaApp.icns
+  else
+    GENSRC_OSX_ICONS_SRC := $(JDK_TOPDIR)/src/closed/macosx/native/sun/osxapp/resource/icons/JavaApp.icns
+  endif
+
+$(GENSRC_OSX_ICONS_DST)/AWTIconData.h: $(GENSRC_OSX_ICONS_SRC)
 	$(RM) $@ $@.tmp
 	$(MKDIR) -p $(dir $@)
 	$(ECHO) "static unsigned char sAWTIconData[] = { " >> $@.tmp