code cleanup: remove ununsed ctrl_embedded

It's a duplicate of CTRL_EMBEDDED.

src/libespeak-ng/readclause.c

 			return terminator;
 		}
 
-		if ((c1 == CTRL_EMBEDDED) || (c1 == ctrl_embedded)) {
+		if (c1 == CTRL_EMBEDDED) {
-			// an embedded command. If it's a voice change, end the clause
+ 			// an embedded command. If it's a voice change, end the clause
 			if (c2 == 'V') {
 				buf[ix++] = 0; // end the clause at this point
 				while (!iswspace(c1 = GetC()) && !Eof() && (ix < (n_buf-1)))
 					continue;
 				}
 
-				if ((iswspace(c2) || (punct_data & CLAUSE_OPTIONAL_SPACE_AFTER) || IsBracket(c2) || (c2 == '?') || Eof() || (c2 == ctrl_embedded))) { // don't check for '-' because it prevents recognizing ':-)'
+				if (iswspace(c2) || (punct_data & CLAUSE_OPTIONAL_SPACE_AFTER) || IsBracket(c2) || (c2 == '?') || Eof() || c2 == CTRL_EMBEDDED) { // don't check for '-' because it prevents recognizing ':-)'
 					// note: (c2='?') is for when a smart-quote has been replaced by '?'
 					is_end_clause = true;
 				}

src/libespeak-ng/translate.c

 PHONEME_LIST2 ph_list2[N_PHONEME_LIST]; // first stage of text->phonemes
 
 wchar_t option_punctlist[N_PUNCTLIST] = { 0 };
-char ctrl_embedded = '\001'; // to allow an alternative CTRL for embedded commands
 
 // these are overridden by defaults set in the "speak" file
 int option_linelength = 0;
 			c = ' ';
 		}
 
-		if ((c == CTRL_EMBEDDED) || (c == ctrl_embedded)) {
+		if (c == CTRL_EMBEDDED) {
 			// start of embedded command in the text
 			int srcix = source_index-1;
 

src/libespeak-ng/translate.h

 extern Translator *translator;
 extern Translator *translator2;
 extern char dictionary_name[40];
-extern char ctrl_embedded;    // to allow an alternative CTRL for embedded commands
 extern espeak_ng_TEXT_DECODER *p_decoder;
 extern int dictionary_skipwords;