Failed linking with `v -cc gcc -parallel-cc examples/sokol/drawing.v`, V ignores it, but it should fail too

[spytheman]

V should fail itself, when it detects that either of the parallel C compilation commands failed, and
when it detects that the final serial linking command failed.
Instead, it finished with exit code 0.

Any program that uses sokol currently leads to that, which is a separate problem.

I think, the root cause, is that sokol and other libraries like it, require that only a single .c file have their implementation symbols (see vlib/sokol/c/declaration.c.v:59:#define SOKOL_IMPL), but the current split makes it so that this define is present in several .c files, not just one => the headers are expanded into their implementation version, not their declarative one).

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_{Huly®: V_0.6-21645}