Fix const-ness of strrchr callers.

This causes build failures in google3 where they use GCC. glibc only
provides const-correct overloads for string functions for GCC >= 4.4,
but clang -- which is what we use -- pretends to be GCC 4.2.

Change-Id: I2a054823ea6201ebcea46d5e77b80a975eefc622