Update std.c [skip ci]

Author: chrchr-github

test/cfg/std.c

@@ -4912,6 +4912,10 @@ void invalidFunctionArgString(char c)
     char d='d';
     /* cppcheck-suppress invalidFunctionArgStr */
     (void)strcat(str,&d);
+
+	/* cppcheck-suppress [bufferAccessOutOfBounds,invalidFunctionArgStr] */
+    char c[] = { 'a', 'b', 'c' };
+    (void)strcat(c, "def");
 }
 
 void ignoredReturnValue_abs(int i)