libpam: bump to 1.2.0

libpam: bump to 1.2.0

 - 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>