Add the const qualifier to the internal definition of memcpy

The second argument of memcpy should be constant, resembling the actual
definition of memcpy in libc. This change will resolve few compiler
warnings shown when building the new artifact libclcore_g.bc, introduced
by id 181869 on android-review.googlesource.com

Change-Id: Ibb78c4c77ef51a9c424cb6a39448be609abc83b6
1 file changed