http.c: don't use curl_easy_strerror prior to curl-7.12.0
Reverts be22d92e (http: avoid empty error messages for some curl errors, 2011-09-05) on platforms with older versions of libcURL where the function is not available. Signed-off-by: NJoachim Schmitz <jojo@schmitz-digital.de> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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