Support for MKSSP=yes for IBM XL Compiler (not tested)
Support for MKSSP=yes for Intel C/C++ Compiler
.undef MKC_CHECK_VAR just like all other MKC_CHECK_*
More complex examples/hello_strlcpy
mk.configure.mk: fix for MKC_SOURCE_FUNCLIBS -> CLEANFILES.
Now all functions.o are added to CLEANFILES unconditionally.
minor code clean-ups