[0.4.9][CMD] Quick fix for the REM command parser. CORE-17030

This avoids spamming "Syntax Errors" to the cmd-prompt when starting the VS2010 command prompt.
Or when typing something like "@Rem Hello" at the prompt.

Fix picked from 0.4.15-dev-202-g 9c11be5a3a

base/shell/cmd/parser.c

@@ -547,9 +547,10 @@ error:
 /* Parse a REM command */
 static PARSED_COMMAND *ParseRem(void)
 {
-    /* Just ignore the rest of the line */
-    while (CurChar && CurChar != _T('\n'))
-        ParseChar();
+    /* "Ignore" the rest of the line.
+     * (Line continuations will still be parsed, though.) */
+    while (ParseToken(0, NULL) != TOK_END)
+        ;
     return NULL;
 }