lib: replace while(ISBLANK()) loops with Curl_str_passblanks() #16520
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replace several ISSPACE() with ISBLANK(), since the former also skips
CR and LF which in most cases should not occur where this macro is
used
after this commit, there is no ISSPACE() user left in libcurl code, but
unfortunately tool and test code use the macro so it cannot be removed.