Add vendor_available to libspeexresampler

Bug: 38244611
Test: build sailfish with BOARD_VNDK_VERSION:=current

(cherry picked from commit 338925ad9bb3a6d0fd37e755d09cfe89279433cc)

Merged-In: I05078430d4d65fc1cae32d64f948ebf527a74245
Change-Id: I26e91b7d8d97e715bf84252b5bc814230d07dde7
diff --git a/Android.bp b/Android.bp
index dd02cae..e3aebf3 100644
--- a/Android.bp
+++ b/Android.bp
@@ -49,6 +49,8 @@
 cc_library_shared {
     name: "libspeexresampler",
 
+    vendor_available: true,
+
     arch: {
         arm: {
             instruction_set: "arm",