libdrm-poulsbo: Provide libdrm-poulsbo instead of libdrm
In order to allow this package to be build alongside the regular
libdrm, it was made to export libdrm-poulsbo and its users make to use
libdrm-poulsbo instead of libdrm. libva and xserver-psb were make to
build against libdrm-poulsbo. While I was in there, I changed a couple
of misspellings of COMPATIBLE and removed a bunch of ';patch=1'.
