Add OSX clang-debug target.
Add macosx-x86-sse2-opencl (ie. 32-bit) build target.
Include uint64_t definition (stdint.h) in common-opencl.h.
uint64_t vs OpenCL fixes. In OpenCL, long is always 64-bit while long long (if
supported at all) is 128-bit. On host side, we use "stdint.h" (not <stdint.h>).
Use "stdint.h" in pbkdf2-hmac-sha512 format.