*.mk configuration files modified for compatibility with latest version
of Mentor Sourcery CodeBench Lite toolchain
(https://sourcery.mentor.com/GNUToolchain/release2641).
All detected issues fixed.
Merge branch 'master' into codesourcery.
All Matt's advices applied.
Assembler and spi driver fixed for compatibility with latest gcc.
Merge pull request #18 from RetroBSD/codesourcery

*.mk files modified for compatibility with Mentor Sourcery CodeBench Lite toolchain
Assembler mode ".set at" enabled by default.
Fixed size_t comparison in memxxx and strxxx finctions.
Fixed bug in stracesecmp left from a previous patch.
Also, a minor issue resolved in proc.h.