4.2.1
[SV 47995] Ensure forced double-colon rules work with -j.
[SV 46433] Show recipe line offsets in line number messages.
[SV 46995] Strip leading/trailing space from variable names
[SV 102] Don't show unnecessary include file errors.
* DELETE_ON_ERROR: [SV 48061] Use "exit 1" for portability.
[SV 41758]: Fix archive support for VMS.
Update the test template. A few fixes in run_make_test(). Rename implicit_prereq_eval to patternrules, to be the start of a suite of tests of pattern rules.