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

*** 177,187 ****
                  (void) sprintf(nice_prio_buf, "-%d", nice_prio);
                  argv[argv_index++] = strdup(nice_prio_buf);
          }
          argv[argv_index++] = shellname;
          argv[argv_index++] = (char*)(ignore_error ? "-c" : "-ce");
!         if ((length = wslen(command)) >= MAXPATHLEN) {
                  tmp_mbs_buffer = getmem((length * MB_LEN_MAX) + 1);
                  (void) wcstombs(tmp_mbs_buffer, command, (length * MB_LEN_MAX) + 1);
                  cmd_argv_index = argv_index;
                  argv[argv_index++] = strdup(tmp_mbs_buffer);
                  retmem_mb(tmp_mbs_buffer);
--- 177,187 ----
                  (void) sprintf(nice_prio_buf, "-%d", nice_prio);
                  argv[argv_index++] = strdup(nice_prio_buf);
          }
          argv[argv_index++] = shellname;
          argv[argv_index++] = (char*)(ignore_error ? "-c" : "-ce");
!         if ((length = wcslen(command)) >= MAXPATHLEN) {
                  tmp_mbs_buffer = getmem((length * MB_LEN_MAX) + 1);
                  (void) wcstombs(tmp_mbs_buffer, command, (length * MB_LEN_MAX) + 1);
                  cmd_argv_index = argv_index;
                  argv[argv_index++] = strdup(tmp_mbs_buffer);
                  retmem_mb(tmp_mbs_buffer);
*** 340,350 ****
           * Reserve argv[0] for sh in case of exec_vp failure.
           * Don't worry about prepending /usr/bin/nice command to argv[0].
           * In fact, doing it may cause the sh command to fail!
           */
          p = &argv[1];
!         if ((length = wslen(command)) >= MAXPATHLEN) {
                  tmp_mbs_buffer = getmem((length * MB_LEN_MAX) + 1);
                  (void) wcstombs(tmp_mbs_buffer, command, (length * MB_LEN_MAX) + 1);
                  argv[0] = strdup(tmp_mbs_buffer);
                  retmem_mb(tmp_mbs_buffer);
          } else {
--- 340,350 ----
           * Reserve argv[0] for sh in case of exec_vp failure.
           * Don't worry about prepending /usr/bin/nice command to argv[0].
           * In fact, doing it may cause the sh command to fail!
           */
          p = &argv[1];
!         if ((length = wcslen(command)) >= MAXPATHLEN) {
                  tmp_mbs_buffer = getmem((length * MB_LEN_MAX) + 1);
                  (void) wcstombs(tmp_mbs_buffer, command, (length * MB_LEN_MAX) + 1);
                  argv[0] = strdup(tmp_mbs_buffer);
                  retmem_mb(tmp_mbs_buffer);
          } else {
*** 371,381 ****
                          t++;
                  }
                  if (*t) {
                          for (*t++ = (int) nul_char; iswspace(*t); t++);
                  }
!                 if ((length = wslen(q)) >= MAXPATHLEN) {
                          tmp_mbs_buffer = getmem((length * MB_LEN_MAX) + 1);
                          (void) wcstombs(tmp_mbs_buffer, q, (length * MB_LEN_MAX) + 1);
                          *p++ = strdup(tmp_mbs_buffer);
                          retmem_mb(tmp_mbs_buffer);
                  } else {
--- 371,381 ----
                          t++;
                  }
                  if (*t) {
                          for (*t++ = (int) nul_char; iswspace(*t); t++);
                  }
!                 if ((length = wcslen(q)) >= MAXPATHLEN) {
                          tmp_mbs_buffer = getmem((length * MB_LEN_MAX) + 1);
                          (void) wcstombs(tmp_mbs_buffer, q, (length * MB_LEN_MAX) + 1);
                          *p++ = strdup(tmp_mbs_buffer);
                          retmem_mb(tmp_mbs_buffer);
                  } else {