include the strerror.h file without curl_ prefix

lib/connect.c

@@ -87,7 +87,7 @@
 #include "urldata.h"
 #include "sendf.h"
 #include "if2ip.h"
-#include "curl_strerror.h"
+#include "strerror.h"
 #include "connect.h"
 
 /* The last #include file should be: */

lib/ftp.c

@@ -91,7 +91,7 @@
 #include "strequal.h"
 #include "ssluse.h"
 #include "connect.h"
-#include "curl_strerror.h"
+#include "strerror.h"
 
 #if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL)
 #include "inet_ntoa_r.h"

lib/strerror.c

@@ -27,7 +27,7 @@
 #include <string.h>
 #include <errno.h>
 
-#include "curl_strerror.h"
+#include "strerror.h"
 
 #define _MPRINTF_REPLACE /* use our functions only */
 #include <curl/mprintf.h>