XML::LibXML 2.0200+ switched its build system to use Alien::Libxml2
(via Alien::Base::Wrapper) to locate libxml2. That module is not
packaged in OpenEmbedded and pulls in the whole Alien::Build stack,
which is why the recipe was previously skipped.
Add a patch that bypasses Alien and queries the target libxml2 through
pkg-config, which is already wired up to the recipe sysroot, and:
- inherit pkgconfig and drop the now-unneeded EXTRA_CPANFLAGS.
- drop the obsolete pre-Alien patches (the libxml2/clang compat fixes
are upstreamed in this release and no longer apply).
- remove SKIP_RECIPE so the recipe builds again.
Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>