make: use the more modern wchar routines, not widec.h

@@ -349,11 +349,11 @@
                  */
                 stdin_buffer_start =
                   stdin_text_p = getmem(length = 1024);
                 stdin_buffer_end = stdin_text_p + length;
                 MBSTOWCS(wcs_buffer, "standard input");
-                file_being_read = (wchar_t *) wsdup(wcs_buffer);
+                file_being_read = (wchar_t *) wcsdup(wcs_buffer);
                 line_number = 0;
                 while ((n = read(fileno(stdin),
                                  stdin_text_p,
                                  length)) > 0) {
                         length -= n;

@@ -825,11 +825,11 @@
                                         INIT_STRING_FROM_STACK(include_name, include_buffer);
                                         APPEND_NAME(true_makefile_name,
                                                       &include_name,
                                                       true_makefile_name->hash.length);
 
-                                        wchar_t *slash = wsrchr(include_name.buffer.start, (int) slash_char);
+                                        wchar_t *slash = wcsrchr(include_name.buffer.start, (int) slash_char);
                                         if (slash != NULL) {
                                                 include_name.text.p = slash + 1;
                                                 append_string(name_start,
                                                               &include_name,
                                                               name_length);