restorecon: optimize speed of init function

and prepare stubs for matchpathcon applet

Change-Id: Ia9ddddf27fea91e4609e29ca4c4f2a59c0f1e052
config: add matchpathcon applet (test)

Change-Id: I26066af35954ecbbb59dd9789314d7d9a5f92e3c
update android prebuilt headers

Change-Id: Ib8b1aaa8cd6750f856f762b2241fb1cb88256046