code cleanup: remove unused REDUCE_T

There is no code related to it.

src/libespeak-ng/translate.h

@@ -328,9 +328,6 @@ typedef struct {
 // bit 5=not if the second word is end-of-sentence
 #define LOPT_COMBINE_WORDS 11
 
-// change [t] when followed by unstressed vowel
-#define LOPT_REDUCE_T 12
-
 // 1 = stressed syllable is indicated by capitals
 #define LOPT_CAPS_IN_WORD 13
 

src/libespeak-ng/voices.c

@@ -117,7 +117,6 @@ enum {
 };
 
 static MNEM_TAB options_tab[] = {
-	{ "reduce_t", LOPT_REDUCE_T },
 	{ "bracket",  LOPT_BRACKET_PAUSE },
 	{ NULL,   -1 }
 };