Set vendor_available: true in libpcre2

This, when used with BOARD_VNDK_VERSION flag, enables the
module to be built and installed twice, one for /system,
other for /vendor

Details: https://android-review.googlesource.com/368372

Bug: 33241851
Test: Set BOARD_VNDK_VERSION:=current in BoardConfig.mk
Change-Id: I6b0c6fd165e00e197a25ea1e2e5978d720c79815
1 file changed