PNaCl: Update Clang revision in pnacl/COMPONENT_REVISIONS
PNaCl: Update Clang revision in pnacl/COMPONENT_REVISIONS

This pulls in the following Clang change:

f91749d: (dschuff@chromium.org) Do not pass -dynamic flag to linker

BUG= https://code.google.com/p/nativeclient/issues/detail?id=3981
TEST= PNaCl toolchain trybots
R=jfb@chromium.org

Review URL: https://codereview.chromium.org/867063002

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client