breaking,vlib: update handling of imports whose symbols are not directly used in imported file, remove pub const is_used = 1
workarounds
#21160
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The changes move from using a workaround with public constants to a less verbose, imho more elegant way to handle imports whose symbols are not directly used (a case mostly for our C wrappers).
This will also remove the "workaround-constants" - that might be confusing - from module documentations. E.g. json, mbedtls and several others
Changes are covered by our current test suite.