lib/curl: drop support for CURL versions older than 7.32.0

For simplicity, this commit removes a workaround for an old CURL bug.

src/lib/curl/Request.cxx

@@ -30,7 +30,6 @@
 #include "config.h"
 #include "Request.hxx"
 #include "Global.hxx"
-#include "Version.hxx"
 #include "Handler.hxx"
 #include "event/Call.hxx"
 #include "util/RuntimeError.hxx"
@@ -124,12 +123,6 @@ CurlRequest::Resume() noexcept
 
 	curl_easy_pause(easy.Get(), CURLPAUSE_CONT);
 
-	if (IsCurlOlderThan(0x072000))
-		/* libcurl older than 7.32.0 does not update
-		   its sockets after curl_easy_pause(); force
-		   libcurl to do it now */
-		global.ResumeSockets();
-
 	global.InvalidateSockets();
 }