o cond.c: do not eval unnecessary terms of conditionals.

o meta.c: report error if lseek in filemon_read fails

o str.c: performance improvement for Str_Match for multiple '*'

o dieQuietly: supress the failure output from make
when failing node is a sub-make or a sibling failed.
This cuts down greatly on unhelpful noise at the end of
build log.  Disabled by -dj or .MAKE.DIE_QUIETLY=no

o unit test for :Or