contrib: preserve symlinks while installing Growl and BGHUDAppkit frameworks

(cherry picked from commit 38ed035eaa96ef8d0ab7bffc274566814f677d2b)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

contrib/src/bghudappkit/rules.mak

@@ -23,5 +23,5 @@ bghudappkit: bghudappkit-git.tar.xz .sum-bghudappkit
 .bghudappkit: bghudappkit
 	cd $< && xcodebuild $(XCODE_FLAGS)
 	install -d $(PREFIX)
-	cd $< && cp -rf build/Release/BGHUDAppKit.framework "$(PREFIX)"
+	cd $< && cp -Rf build/Release/BGHUDAppKit.framework "$(PREFIX)"
 	touch $@

contrib/src/growl/rules.mak

@@ -22,5 +22,5 @@ growl: growl-$(GROWL_VERSION).tar.bz2 .sum-growl
 .growl: growl
 	cd $< && xcodebuild $(XCODE_FLAGS) -target Growl.framework -configuration Release
 	install -d $(PREFIX)
-	cd $< && cp -rf build/Release/Growl.framework "$(PREFIX)"
+	cd $< && cp -Rf build/Release/Growl.framework "$(PREFIX)"
 	touch $@