Removed PKG_FIXUP. It has no meaning with CMake.
Replaced PKG_INSTALL with CMAKE_INSTALL. Consequentially, removed
InstallDev section.
Added ABI_VERSION to force package rebuilds when it increases.
Added PKG_BUILD_PARALLEL for faster compilation.
Fixed license tag.
Signed-off-by: Rosen Penev <rosenp@gmail.com>