Add winsock2 headers for curl's use of select() on sockets

src/input/curl_input_plugin.c

@@ -25,7 +25,13 @@
 #include "icy_metadata.h"
 
 #include <assert.h>
-#include <sys/select.h>
+
+#if defined(WIN32)
+	#include <winsock2.h>
+#else
+	#include <sys/select.h>
+#endif
+
 #include <string.h>
 #include <errno.h>