Use cp -R instead of cp -r for OS X compatibility

In GNU cp, -r and -R are equivalent.

For the cp in OS X: "Historic versions of the cp utility had a -r
option. This implementation supports that option; however, its use is
strongly discouraged, as it does not correctly copy special files,
symbolic links, or fifo's."

Using cp -r meant that the symlinks in the LibreOfficePython.framework
were not properly re-created in instdir.

Change-Id: I8367269a77b876c063fd21ceb919936215fb7d37

solenv/gbuild/GeneratedPackage.mk

@@ -24,7 +24,7 @@ gb_GeneratedPackage__get_destdir = $(firstword $(subst :, ,$(1)))
 
 define gb_GeneratedPackage__command_cp
 mkdir -p $(dir $(INSTDIR)/$(2)) && \
-cp -r $(PACKAGE_SOURCEDIR)/$(1) $(INSTDIR)/$(2)
+cp -R $(PACKAGE_SOURCEDIR)/$(1) $(INSTDIR)/$(2)
 endef
 
 define gb_GeneratedPackage__command