The code uses __BEGIN/END_DECLS from glibc's features.h, actually
sys/cdefs.h, which is deprecated. Get rid of it.

Fixed license information.

Fixed musl-fts dependency. It's only valid for musl.

Removed autoreconf as the patch was removed.

Added PKG_INSTALL for consistency between packages.

Added PKG_BUILD_PARALLEL for faster compilation.

Small cleanups for consistency between packages.

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