code cleanup: move CheckTranslator() to langopts.c

src/libespeak-ng/langopts.c

 #include <stdlib.h>
 #include <string.h>
 
-static int LookupTune(const char *name);
-
 #include <espeak-ng/espeak_ng.h>
 #include <espeak-ng/speak_lib.h>
 #include <espeak-ng/encoding.h>
 #include "voice.h"                    // for CheckTranslator()
 #include "synthdata.h"                    // for n_tunes, tunes
 
+static int CheckTranslator(Translator *tr, const MNEM_TAB *keyword_tab, int key);
+static int LookupTune(const char *name);
+
 enum {
 	V_NAME = 1,
 	V_LANGUAGE,
 	return -1;
 }
 
+int CheckTranslator(Translator *tr, const MNEM_TAB *keyword_tab, int key)
+{
+	// Return 0 if translator is set.
+	// Return 1 and print an error message for specified key if not
+	// used for parsing language options
+	if (tr)
+		return 0;
+
+	fprintf(stderr, "Cannot set %s: language not set, or is invalid.\n", LookupMnemName(keyword_tab, key));
+	return 1;
+}

src/libespeak-ng/voice.h

 extern voice_t *voice;
 extern int tone_points[12];
 
-int CheckTranslator(Translator *tr, const MNEM_TAB *keyword_tab, int key);
 const char *SelectVoice(espeak_VOICE *voice_select, int *found);
 espeak_VOICE *SelectVoiceByName(espeak_VOICE **voices, const char *name);
 voice_t *LoadVoice(const char *voice_name, int control);

src/libespeak-ng/voices.c

 	}
 }
 
-int CheckTranslator(Translator *tr, const MNEM_TAB *keyword_tab, int key)
-{
-	// Return 0 if translator is set.
-	// Return 1 and print an error message for specified key if not
-	// used for parsing language options
-	if (tr)
-		return 0;
-
-	fprintf(stderr, "Cannot set %s: language not set, or is invalid.\n", LookupMnemName(keyword_tab, key));
-	return 1;
-}
-
 voice_t *LoadVoice(const char *vname, int control)
 {
 	// control, bit 0  1= no_default