Use clang tools in openjdk11 build

Prepend the clang bin direcotry to the PATH so that configure finds
tools like dsymutil from the hermetic clang instead of /usr/bin.  Fixes
an incompatibility between the updated clang and the host dsymutil.

Bug: 182620358
Test: builds
Change-Id: If2a4cd4749c7745c9f05f799311e3899c9ec9122
1 file changed