Terminal: Add support for z/OS terminal

the z/OS terminal understands standard vt100 escape codes, however since
the system uses EBCDIC, the escape character has a different encoding.

Terminal.c

@@ -209,27 +209,34 @@ static int kwsysTerminalStreamIsVT100(FILE* stream, int default_vt100,
 }
 
 /* VT100 escape sequence strings.  */
-#define KWSYS_TERMINAL_VT100_NORMAL "\33[0m"
-#define KWSYS_TERMINAL_VT100_BOLD "\33[1m"
-#define KWSYS_TERMINAL_VT100_UNDERLINE "\33[4m"
-#define KWSYS_TERMINAL_VT100_BLINK "\33[5m"
-#define KWSYS_TERMINAL_VT100_INVERSE "\33[7m"
-#define KWSYS_TERMINAL_VT100_FOREGROUND_BLACK "\33[30m"
-#define KWSYS_TERMINAL_VT100_FOREGROUND_RED "\33[31m"
-#define KWSYS_TERMINAL_VT100_FOREGROUND_GREEN "\33[32m"
-#define KWSYS_TERMINAL_VT100_FOREGROUND_YELLOW "\33[33m"
-#define KWSYS_TERMINAL_VT100_FOREGROUND_BLUE "\33[34m"
-#define KWSYS_TERMINAL_VT100_FOREGROUND_MAGENTA "\33[35m"
-#define KWSYS_TERMINAL_VT100_FOREGROUND_CYAN "\33[36m"
-#define KWSYS_TERMINAL_VT100_FOREGROUND_WHITE "\33[37m"
-#define KWSYS_TERMINAL_VT100_BACKGROUND_BLACK "\33[40m"
-#define KWSYS_TERMINAL_VT100_BACKGROUND_RED "\33[41m"
-#define KWSYS_TERMINAL_VT100_BACKGROUND_GREEN "\33[42m"
-#define KWSYS_TERMINAL_VT100_BACKGROUND_YELLOW "\33[43m"
-#define KWSYS_TERMINAL_VT100_BACKGROUND_BLUE "\33[44m"
-#define KWSYS_TERMINAL_VT100_BACKGROUND_MAGENTA "\33[45m"
-#define KWSYS_TERMINAL_VT100_BACKGROUND_CYAN "\33[46m"
-#define KWSYS_TERMINAL_VT100_BACKGROUND_WHITE "\33[47m"
+#if defined(__MVS__)
+/* if building on z/OS (aka MVS), assume we are using EBCDIC */
+#  define ESCAPE_CHAR "\47"
+#else
+#  define ESCAPE_CHAR "\33"
+#endif
+
+#define KWSYS_TERMINAL_VT100_NORMAL ESCAPE_CHAR "[0m"
+#define KWSYS_TERMINAL_VT100_BOLD ESCAPE_CHAR "[1m"
+#define KWSYS_TERMINAL_VT100_UNDERLINE ESCAPE_CHAR "[4m"
+#define KWSYS_TERMINAL_VT100_BLINK ESCAPE_CHAR "[5m"
+#define KWSYS_TERMINAL_VT100_INVERSE ESCAPE_CHAR "[7m"
+#define KWSYS_TERMINAL_VT100_FOREGROUND_BLACK ESCAPE_CHAR "[30m"
+#define KWSYS_TERMINAL_VT100_FOREGROUND_RED ESCAPE_CHAR "[31m"
+#define KWSYS_TERMINAL_VT100_FOREGROUND_GREEN ESCAPE_CHAR "[32m"
+#define KWSYS_TERMINAL_VT100_FOREGROUND_YELLOW ESCAPE_CHAR "[33m"
+#define KWSYS_TERMINAL_VT100_FOREGROUND_BLUE ESCAPE_CHAR "[34m"
+#define KWSYS_TERMINAL_VT100_FOREGROUND_MAGENTA ESCAPE_CHAR "[35m"
+#define KWSYS_TERMINAL_VT100_FOREGROUND_CYAN ESCAPE_CHAR "[36m"
+#define KWSYS_TERMINAL_VT100_FOREGROUND_WHITE ESCAPE_CHAR "[37m"
+#define KWSYS_TERMINAL_VT100_BACKGROUND_BLACK ESCAPE_CHAR "[40m"
+#define KWSYS_TERMINAL_VT100_BACKGROUND_RED ESCAPE_CHAR "[41m"
+#define KWSYS_TERMINAL_VT100_BACKGROUND_GREEN ESCAPE_CHAR "[42m"
+#define KWSYS_TERMINAL_VT100_BACKGROUND_YELLOW ESCAPE_CHAR "[43m"
+#define KWSYS_TERMINAL_VT100_BACKGROUND_BLUE ESCAPE_CHAR "[44m"
+#define KWSYS_TERMINAL_VT100_BACKGROUND_MAGENTA ESCAPE_CHAR "[45m"
+#define KWSYS_TERMINAL_VT100_BACKGROUND_CYAN ESCAPE_CHAR "[46m"
+#define KWSYS_TERMINAL_VT100_BACKGROUND_WHITE ESCAPE_CHAR "[47m"
 
 /* Write VT100 escape sequences to the stream for the given color.  */
 static void kwsysTerminalSetVT100Color(FILE* stream, int color)