Switch patchlevel to 1 to fix Mac build.

The linker on Mac can only accept shorter strings of digits, rather than
our original long string. Let's move back to using a very low number
that we can then reset when we have a major/minor version update for any
future release.

Test: toolchain/llvm/android/build.py
Change-Id: I96bea5312a372af230e849d80e0d6904fcb6efd4