The native .pc files currently have hardcoded paths in them meaning each has
to be relocated at final install time. pkg-config has built in functionality
to avoid this, namely the pcfiledir variable.
This function translates .pc files to use the variable meaning further
relocation later is unnecessary.
(From OE-Core rev: a3f4e9ff55c7d9eba175e83eb6c99cf349a74432)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>