use checked in bazel for building kythe index

Change-Id: I91d395137fa46981433369615140352567b9ab44
diff --git a/linux-x86_64/kythe/studio/build_studio_kythe.sh b/linux-x86_64/kythe/studio/build_studio_kythe.sh
index c9c5ff7..64ab1ad 100755
--- a/linux-x86_64/kythe/studio/build_studio_kythe.sh
+++ b/linux-x86_64/kythe/studio/build_studio_kythe.sh
@@ -22,7 +22,7 @@
 TARGETS="$(cat tools/base/bazel/build_targets)"
 
 # Build all targets and run the kythe extractor via extra_actions.
-bazel build \
+tools/base/bazel/bazel build \
   --experimental_action_listener=${EAL} -- ${TARGETS}
 
 # Find all generated kythe index files.