build/process_compilers: Skip throwing error for headers

Dependencies should be able to provide headers in its sources, even tho
the target which uses the dependency may not use the language that
header is for.

A specific example is vala, where C and Vala dependencies share the same
name, so in meson they ought to share the same dependency object in
order to provide a Vala and/or C dependency depending on who is using
it. Doing so right now however fails, if the project of the dependency
user doesn't list vala in its used languages, even tho they might just
be interested in the C part of the dependency.

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