Remove unused wchar.h and wctype.h includes.

src/libespeak-ng/compiledict.c

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <wctype.h>
 
 #include <espeak-ng/espeak_ng.h>
 #include <espeak-ng/speak_lib.h>

src/libespeak-ng/dictionary.c

 #include <stdlib.h>
 #include <string.h>
 #include <wchar.h>
-#include <wctype.h>
 
 #include <espeak-ng/espeak_ng.h>
 #include <espeak-ng/speak_lib.h>

src/libespeak-ng/fifo.c

 #include <sys/time.h>
 #include <time.h>
 #include <unistd.h>
-#include <wchar.h>
 
 #include <espeak-ng/espeak_ng.h>
 

src/libespeak-ng/intonation.c

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <wctype.h>
 
 #include <espeak-ng/espeak_ng.h>
 #include <espeak-ng/speak_lib.h>

src/libespeak-ng/numbers.c

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <wchar.h>
 #include <wctype.h>
 
 #include <espeak-ng/espeak_ng.h>

src/libespeak-ng/setlengths.c

 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <wctype.h>
 
 #include <espeak-ng/espeak_ng.h>
 #include <espeak-ng/speak_lib.h>

src/libespeak-ng/synth_mbrola.c

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <wctype.h>
 
 #include <espeak-ng/espeak_ng.h>
 #include <espeak-ng/speak_lib.h>

src/libespeak-ng/synthdata.c

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <wctype.h>
 
 #include <espeak-ng/espeak_ng.h>
 #include <espeak-ng/speak_lib.h>

src/libespeak-ng/synthesize.c

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <wctype.h>
 
 #include <espeak-ng/espeak_ng.h>
 #include <espeak-ng/speak_lib.h>

src/libespeak-ng/tr_languages.c

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <wctype.h>
 
 #include <espeak-ng/espeak_ng.h>
 #include <espeak-ng/speak_lib.h>

src/libespeak-ng/voices.c

 #include <stdlib.h>
 #include <string.h>
 #include <strings.h>
-#include <wctype.h>
 
 #if defined(_WIN32) || defined(_WIN64)
 #include <windows.h>