Import bmake-20210621vendor/NetBSD/bmake/20210621

Lots more unit tests and code cleanup

Relevant changes from ChangeLog

	o job.c: Print -de error information when running multiple jobs
	o var.c: only report error for unmatched regex subexpression
	when linting (-dL) since we cannot tell when an unmatched
	subexpression is an expected result.
	reduce memory allocations in the modifiers ':D' and ':U'
	reduce memory allocation and strlen calls in modifier ':from=to'
	in the ':Q' modifier, only allocate memory if necessary
	improve performance for LazyBuf
	reduce debug logging and memory allocation for ${:U...}
	reduce verbosity of the -dv debug logging for standard cases
	fix double varname expansion in the variable modifier '::='
	o var.c: avoid evaluating many modifiers in parse only mode
	in strict mode (-dL) many variable references are parsed twice,
	the first time just to report parse errors early, so we want to
	avoid side effects and wasted effort to the extent possible.

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