Do not use PCRE2 in libselinux_vendor

Also make sure regex.c is compiled for all targets that libselinux is
built for.

Bug: 37919668
Bug: 37343404
Test: Build and boot

(cherry-pick from commit a1b5897b8b8d1812abb211d5cde1efec96c4c665)

Change-Id: I7eaf2733cdc0f8c72239fa6186e21bacc18b6d2f
Merged-In: Ie73cf85aeffcccb1a8bd1fcfafdd555678f9badc
1 file changed