src/tty/: sanitized sprinkled 'const' qualifiers

Signed-off-by: Sergei Trofimovich <slyfox@inbox.ru>

src/tty/color-internal.h

@@ -23,7 +23,7 @@ struct color_table_s {
     int  value;
 };
 
-extern const struct color_table_s const color_table [];
+extern const struct color_table_s color_table [];
 
 #ifdef HAVE_SLANG
 #   define CTYPE const char *

src/tty/key.c

@@ -197,7 +197,7 @@ typedef struct key_def {
 				   Escape */
 } key_def;
 
-typedef const struct {
+typedef struct {
     int code;
     const char *seq;
     int action;

src/tty/tty-slang.c

@@ -474,10 +474,10 @@ tty_print_alt_char (int c)
 void
 tty_print_anychar (int c)
 {
-    unsigned char str[6 + 1];
+    char str[6 + 1];
 
     if ( c > 255 ) {
-        int res = g_unichar_to_utf8 (c, (char *)str);
+        int res = g_unichar_to_utf8 (c, str);
         if ( res == 0 ) {
             str[0] = '.';
             str[1] = '\0';