CURL_DOES_CONVERSIONS: cleanup

Massively reduce #ifdefs all over (23 #ifdef lines less so far)
Moved conversion-specific code to non-ascii.c

lib/http_proxy.c

@@ -33,6 +33,7 @@
 #include "select.h"
 #include "rawstr.h"
 #include "progress.h"
+#include "non-ascii.h"
 
 #define _MPRINTF_REPLACE /* use our functions only */
 #include <curl/mprintf.h>
@@ -315,14 +316,12 @@ CURLcode Curl_proxyCONNECT(struct connectdata *conn,
                   char letter;
                   int writetype;
 
-#ifdef CURL_DOES_CONVERSIONS
                   /* convert from the network encoding */
                   result = Curl_convert_from_network(data, line_start,
                                                      perline);
                   /* Curl_convert_from_network calls failf if unsuccessful */
                   if(result)
                     return result;
-#endif /* CURL_DOES_CONVERSIONS */
 
                   /* output debug if that is requested */
                   if(data->set.verbose)