src/test: Fix compilation with GCC 15

Tag some missed character arrays with NXT_NONSTRING.

See commit d9c2fd7 ("Tag various character arrays with NXT_NONSTRING")
for details.

Signed-off-by: Andrew Clayton <[email protected]>

Author: ac000

src/test/nxt_http_parse_test.c

@@ -12,7 +12,7 @@ typedef struct {
     nxt_str_t  method;
     nxt_str_t  target;
     nxt_str_t  args;
-    u_char     version[8];
+    u_char     version[8] NXT_NONSTRING;
 
     /* target with "/." */
     unsigned   complex_target:1;

src/test/nxt_utf8_file_name_test.c

@@ -48,7 +48,7 @@ nxt_utf8_file_name_test(nxt_thread_t *thr)
     nxt_file_t           uc_file, lc_file;
     const u_char         *pp;
     nxt_file_name_t      uc_name[10], lc_name[10];
-    static const u_char  utf8[4] = "UTF8";
+    static const u_char  utf8[4] NXT_NONSTRING = "UTF8";
 
     nxt_thread_time_update(thr);