package.bbclass: Drop EXPORT_FUNCTIONS use against mapping_rename_hook

The usage of this function renaming and it being called using
bb.build.exec_func() causes needless indirection loops, confusing log
files and seems generally pointless.

This simplification makes the process much simpler and faster. I can't
come up with a good reason why the export_functions functionality is
needed for this function.

(From OE-Core rev: 74daad03ca29a03b0005f7d2b90a0347d5b583a5)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/package.bbclass

@@ -1788,7 +1788,7 @@ addtask package_write before do_build after do_package
 # Helper functions for the package writing classes
 #
 
-python package_mapping_rename_hook () {
+def mapping_rename_hook(d):
 	"""
 	Rewrite variables to account for package renaming in things
 	like debian.bbclass or manual PKG variable name changes
@@ -1799,6 +1799,4 @@ python package_mapping_rename_hook () {
 	runtime_mapping_rename("RPROVIDES", d)
 	runtime_mapping_rename("RREPLACES", d)
 	runtime_mapping_rename("RCONFLICTS", d)
-}
 
-EXPORT_FUNCTIONS mapping_rename_hook