[SV 12078, SV 62809] Rebuild grouped targets if any is missing

[SV 12078, SV 62809] Rebuild grouped targets if any is missing

If any of a set of grouped targets is missing or out of date, even
if make is not trying to build that target, rebuild them all.
Ensure this is true for explicit grouped targets as well as pattern
rule grouped targets.

Original patch by Jonathan Gravel <jo@stashed.dev>

* src/remake.c (update_file_1): After matching any pattern rules,
go through the also_make targets and set noexist as needed.  Also
compute the oldest this_mtime.
* tests/scripts/features/grouped_targets: Add regression tests.
* tests/scripts/features/patternrules: Ditto.
* tests/features/vpath: Rewrite to use modern run_make_test().
Add a test that we check for VPATH before implicit rule search.
Move the tests in vpath2 and vpath3 into this suite.
* tests/features/vpathplus: Rewrite to use modern run_make_test().