zlib-ng_2.3.3-1

sanity_checks: note 0.63+ requirement even if *_std is conditionalized

A version-conditionalized c_std/cpp_std in default_options is easy enough
to match with a regex.  Before using `meson rewrite` to read
default_options for the *_std check, mangle any conditionalized *_std back
to the legacy value.  We don't need to report a version dependency for the
non-legacy value because it's already conditionalized, but we do need to
require Meson >= 0.63 in any case.