Merge branch 'topic/makefile-dev.2'

Merge branch 'topic/makefile-dev.2'

* topic/makefile-dev.2:
  mk-conf.sh:path_check(): skip any "fakeroot" path (Hilko Bengen)
  mk-conf.sh, mk-mk.in: tiny steps
  make.rc, mk-conf.sh: allow y/n booleans
  Ensure reproducable environment..
  makefile:_update-release: we also distribute the tarball now
  Rename ADD(C|LD)LAGS to EXTRA_(C|LD)FLAGS..
  Tweak VERBOSE handling (William Yodlowsky)..
  mk-conf.sh, mk-mk.in: diversify..
  mk-conf.sh: do not use strcpy(), avoid linker warning (sigh)
  Add WANT_CROSS_BUILD make.rc option (Juan RP)..
  mk-conf.sh: test and USE -Wl,-rpath!  sort a bit
  makefile:_update-release: regenerate tcaps.h and okeys.h..
  Change make targets; add $MAILJOBS; don't track $DESTDIR (Gaetan Bisson)..
  makefile: for later, not to forget: add d-gettext target
  makefile: add d(evel)-b(uild) target