Remove superfluous determination of cURL version #16787
Merged
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This was originally meant to distinguish between libcurl 7.59.0 and earlier; only the latter would need to be linked against normalize.lib, libssh2.lib and nghttp2.lib[1]. That would only have catered to our builds, and might not have been correct anyway. However, the version check was wrong (paren error), and has been removed in the meantime[2].
Given that cURL 7.59.0 is rather old, we do not reinstate the version check, but rather drop the now superfluous (and improper) determination of the cURL version. A nice bonus is that we get rid of some global variables.
[1] a1ba300
[2] 94a12d5