Fix flags usage for static build #203
Merged
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The flag we've been using and documenting for static builds does the work, but is not correct:
It should be "-static" (compiler option, as expected by gcc for example) and not "--static" (linker option, gcc translates the former into the latter when invoking the linker).
It should not be passed with the CFLAGS (or in our case, EXTRA_CFLAGS), but instead with the LDFLAGS (or EXTRA_LDFLAGS), because it is a flag that will be passed to the linker.
Fix it in the README.md and in CI/release workflows.