native.bbclass: Fix variable remapping coverage

When looking for RDEPENDS to process, bitbake iterates through PACKAGES
*and* PN. Since native.bbclass sets PACKAGES to be empty, its pointless
remapping the list of PACKAGES since this does nothing. There is a problem
since *_${PN} are used by bitbake but not remapped by the native.bbclass
class extension code.

This changes the code to remap _${PN} in both expanded and unexpanded
forms. As a result of this, various surprising dependencies are uncovered
and the patch rectifies those. These are real bugs since they're injecting
unneeded (unremapped) dependencies into the dependency chain.

(From OE-Core rev: 0f485bfd6fc82a109b9da629e464fca1e90faec3)

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

meta/recipes-devtools/python/python-native_2.7.2.bb

@@ -18,6 +18,8 @@ S = "${WORKDIR}/Python-${PV}"
 
 inherit native
 
+RPROVIDES += "python-distutils-native python-compression-native python-textutils-native"
+
 EXTRA_OEMAKE = '\
   BUILD_SYS="" \
   HOST_SYS="" \