Revert "php: add bbappend to backport fixes from master"

This reverts commit 48aad18ccc697a395f905d4a35e27abf5e0c5f66. The
proper fix for this has been merged in 'daisy' branch of
meta-openembedded.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Revert "libxml2: add bbappend to work around poky issue"

This reverts commit 32128695f1a0d890811baadf317dceaaa787b2d2. This
change has been identified to break the RPM backend use with the Yocto
Project. So it has been not applied in OE-Core.

The requirement for zlib has been documented in OE-Core[1].

1. http://git.openembedded.org/openembedded-core/commit/?id=7d056397ab9912316064db850aae05aacabc726c

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>