Fix building on Windows.

src/libespeak-ng/dictionary.h

@@ -30,7 +30,7 @@ extern "C"
 {
 #endif
 
-void strncpy0(char *to, const char *from, int size);
+extern ESPEAK_NG_API void strncpy0(char *to, const char *from, int size);
 int LoadDictionary(Translator *tr, const char *name, int no_error);
 int HashDictionary(const char *string);
 const char *EncodePhonemes(const char *p, char *outptr, int *bad_phoneme);

src/libespeak-ng/speech.h

@@ -70,8 +70,7 @@ void cancel_audio(void);
 
 extern char path_home[N_PATH_HOME];    // this is the espeak-ng-data directory
 
-extern ESPEAK_NG_API void strncpy0(char *to, const char *from, int size);
-extern ESPEAK_NG_API int  GetFileLength(const char *filename);
+extern ESPEAK_NG_API int GetFileLength(const char *filename);
 
 #ifdef __cplusplus
 }