Build bionic versioner

Bug: 113263746
Test: ./prebuilts/clang-tools/build-prebuilts.sh
Change-Id: I6a247734de9bd4dcd880399d5e5cabef73c2e4de
diff --git a/build-prebuilts.sh b/build-prebuilts.sh
index 1bdc070..305ce56 100755
--- a/build-prebuilts.sh
+++ b/build-prebuilts.sh
@@ -18,6 +18,9 @@
 export LLVM_PREBUILTS_VERSION=clang-r339409b
 export LLVM_RELEASE_VERSION=8.0.2
 
+# FIXME: Workaround to build bionic versioner in the aosp/clang-tools branch.
+export FORCE_BUILD_LLVM_COMPONENTS=true
+
 if [ -z "${OUT_DIR}" ]; then
     echo "error: Must set OUT_DIR"
     exit 1
@@ -57,6 +60,7 @@
     "header-abi-dumper"
     "header-abi-diff"
     "merge-abi-diff"
+    "versioner"
 )
 
 binaries=()