Introduce CC/CXX/JAVAC_WRAPPER to wrap the calls to clang.

This is essentially Ide800c24f0c2ebbb1cfb358bd8f99ec8a9d41253
applied to clang.

Change-Id: I883f9e9a31fff50a64568a06ef5248437344542b
Merge "Introduce CC/CXX/JAVAC_WRAPPER to wrap the calls to clang."
Revert "Introduce CC/CXX/JAVAC_WRAPPER to wrap the calls to clang."

This broke the world.

This reverts commit 3b7a4d811df5b326e714984edd7dd3e2b11e16d5.

Change-Id: Iefb01b8642a92bcc718d2c745e8ce1346ba50143
Merge "Revert "Introduce CC/CXX/JAVAC_WRAPPER to wrap the calls to clang.""