buildsys: simplify C compilation build rule #2704
Merged
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Instead of having two Makefile rules for C compilation, one for gen/.c and one for src/.c, use a single rule, by uniformly placing the object files for FOO/.c into obj/FOO/.c.
As a side effect, it now becomes trivial to use the general build rule for C
files in arbitrary locations, e.g. as part of the test suite.
This change comes from PR #2667, but it may be of independent use in PR #2702 for the C test file; and also for writing C based kernel tests, see issue #1917.