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Version 4.12 of python-pyqt that we are about to upgrade to requires sip
4.19 which is already in meta-oe, so this version is no longer working.
We shouldn't really be carrying a duplicate recipe here, but on the
other hand we don't want to be adding a hard dependency on meta-oe
either. As a compromise, drop the sip recipe here and require the user
to add meta-oe in order to build it, and a corresponding note to the
README.
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>