Update bmake and mk-files.

bmake is sync'd with -current make as of 2004-02-20
Fixes include:
o fix for old :M parsing bug.
o re-jigged unit-tests
o search upwards for *.mk
o fix for double free of var substitution buffers
o use of getopt replaced with custom code, since the usage
  (re-scanning) isn't posix compatible.
* arch.c: don't include ranlib.h on ELF systems

mk-files adds dpadd.mk (cool magic driven by DPADD)
and a re-worked warnings.mk (very cool).
Also fixes:
* own.mk: don't use NetBSD's _SRC_TOP_ it can
  cause confusion.  Also don't take just 'mk' as a
  srctop indicator.
* Generic.sys.mk: need to use ${.PARSEDIR} with exists().

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