Log Message:
Update to version 0.30.0

  Variables MKC_{CHECK,REQUIRE}_HEADER_FILES were introduced.

  Improvements and addons to regression tests.

  Improvements and minor fixes in mkc_check_{header,decl,funclib,sizeof}
  This may fix checking failure if -Werror=strict-prototyping
      is passed to CFLAGS.

  OBJDIR_<project> is now set correctly if MAKEOBJDIRPREFIX is set.