Update Makefile to modern standards.

Switched to local tarballs..xz archives are smaller. The .gz archive that
codeload comes with is 85MB.

Replaced PKG_INSTALL with CMAKE_INSTALL to get rid of Build/InstallDev.

Added PKG_BUILD_PARALLEL for faster compilation.

Removed inactive maintainer.

Added uClibc-ng patches to fix compilation.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

The github repository URL changed.

Signed-off-by: Rosen Penev <rosenp@gmail.com>