Remove additional uses of function_exists() where no longer necessary

Author: zachborboa

src/Curl/Curl.php

@@ -494,7 +494,7 @@ public function exec($ch = null)
         $this->headerCallbackData->stopRequest = false;
 
         // Include additional error code information in error message when possible.
-        if ($this->curlError && function_exists('curl_strerror')) {
+        if ($this->curlError) {
             $this->curlErrorMessage =
                 curl_strerror($this->curlErrorCode) . (
                     empty($this->curlErrorMessage) ? '' : ': ' . $this->curlErrorMessage
@@ -1567,7 +1567,7 @@ public function diagnose($return = false)
      */
     public function reset()
     {
-        if (function_exists('curl_reset') && (is_resource($this->curl) || $this->curl instanceof \CurlHandle)) {
+        if (is_resource($this->curl) || $this->curl instanceof \CurlHandle) {
             curl_reset($this->curl);
         } else {
             $this->curl = curl_init();