cmd: Output error messages to stderr instead of stdout where appropriate.

programs/cmd/builtins.c

@@ -1124,7 +1124,7 @@ void WCMD_for (WCHAR *p, CMD_LIST **cmdList) {
           /* Process the input file */
           if (input == INVALID_HANDLE_VALUE) {
             WCMD_print_error ();
-            WCMD_output (WCMD_LoadMessage(WCMD_READFAIL), item);
+            WCMD_output_stderr(WCMD_LoadMessage(WCMD_READFAIL), item);
             errorlevel = 1;
             return; /* FOR loop aborts at first failure here */
 
@@ -1539,7 +1539,7 @@ void WCMD_if (WCHAR *p, CMD_LIST **cmdList) {
     WCMD_parameter(s, 1, &command, NULL);
   }
   else {
-    WCMD_output (WCMD_LoadMessage(WCMD_SYNTAXERR));
+    WCMD_output_stderr(WCMD_LoadMessage(WCMD_SYNTAXERR));
     return;
   }
 

programs/cmd/wcmdmain.c

@@ -1055,7 +1055,7 @@ void WCMD_run_program (WCHAR *command, int called) {
     if (strchrW(param1, '.') != NULL) extensionsupplied = TRUE;
     if (strlenW(param1) >= MAX_PATH)
     {
-        WCMD_output_asis(WCMD_LoadMessage(WCMD_LINETOOLONG));
+        WCMD_output_asis_stderr(WCMD_LoadMessage(WCMD_LINETOOLONG));
         return;
     }
 
@@ -1836,9 +1836,9 @@ WCHAR *WCMD_ReadAndParseLine(const WCHAR *optionalcmd, CMD_LIST **output,
 
     /* Handle truncated input - issue warning */
     if (strlenW(extraSpace) == MAXSTRING -1) {
-        WCMD_output_asis(WCMD_LoadMessage(WCMD_TRUNCATEDLINE));
-        WCMD_output_asis(extraSpace);
-        WCMD_output_asis(newline);
+        WCMD_output_asis_stderr(WCMD_LoadMessage(WCMD_TRUNCATEDLINE));
+        WCMD_output_asis_stderr(extraSpace);
+        WCMD_output_asis_stderr(newline);
     }
 
     /* Replace env vars if in a batch context */