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

(cherry picked from commit f60d843f4c8ccf3fdcd083e45aa7efbba607b1ac)

Merged-In: I6b0c6fd165e00e197a25ea1e2e5978d720c79815
Change-Id: I9d5f0698779de45a5a05750ccb48830ce22c1cb3
diff --git a/Android.bp b/Android.bp
index 6f5f6f4..d57b4c2 100644
--- a/Android.bp
+++ b/Android.bp
@@ -45,6 +45,7 @@
     name: "libpcre2",
     defaults: ["pcre_defaults"],
     host_supported: true,
+    vendor_available: true,
     srcs: libpcre2_src_files,
     target: {
         linux_bionic: {