base32/base64/basenc: implement and test proper flag parsing #6007
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This PR fixes several issues:
basencwas not tested – it already works, yes, but let's make sure it doesn't regress.basencshould not decide according to some arbitrary built-in priority list (ENCODINGS), but rather let the last encoding on the command-line override any earlier ones. (This fixes a GNU behavior bug.)-d,-i, and-w. (This fixes a GNU behavior bug.)This fixes #5998 for the special case of
base32,base64, andbasenc.