SHRTOUT=yes support for mkc_imp.dep.mk
Introduce and document DPSRCS. It works just like in NetBSD mk files.
Regression tests for DPSRCS
mkc_imp.dep.mk: fix problem if PROGS is defined and SRCS is empty.
One more regression test for target "depend" (for mkc.subprj.mk project)
.NOPATH for files generated by mkc_imp.intexts.mk
examples/hello_TARGETS: one more example for TARGETS use
All test are run with MKCATPAGES=no by default