Upstream switched to GitHub for releases. Follow suit.

Rearranged Makefile quite a bit to be more similar to other projects.

Added PKG_BUILD_PARALLEL for faster compilation.

Added PKG_CPE_ID for proper CVE tracking.

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

- Update PKG_MD5SUM.
 - Update PKG_RELEASE.
 - Update patch 0001- to always use /lib directory.
 - Refresh other patches.

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

- Add configure options --disable-nis, --disable-regenerate-docu
 - 000-OE-libpam-xtests.patch is not relevant in OpenWrt
 - 001-no_nis.patch was dropped because we now --disable-nis
 - 002-no_yywrap.patch was dropped be cause it was fixed in 1.2.0
 - 003-no_doc was dropped because we ignore doc/ with
   --disable-regenreate-docu
 - 004-fix_lib64 was replaced by new 0001-build-use-host_cpu...
 - pam_rhosts will not be built with musl because ruserok{,_af{
   are not available
 - pam_lastlog will not be built with musl because logwtmp is missing

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>