Include dictionary.h in the relevant source files to avoid implicit-function-declaration warnings.

src/libespeak-ng/compiledata.c

 #include "synthesize.h"
 #include "spect.h"
 #include "translate.h"
+#include "dictionary.h"
 
 #define N_ITEM_STRING 256
 

src/libespeak-ng/error.c

 #include "phoneme.h"
 #include "voice.h"
 #include "synthesize.h"
+#include "dictionary.h"
 
 espeak_ng_STATUS
 create_file_error_context(espeak_ng_ERROR_CONTEXT *context,

src/libespeak-ng/ssml.c

 #include "voice.h"
 #include "synthesize.h"
 #include "translate.h"
+#include "dictionary.h"
 #include "ssml.h"
 
 static MNEM_TAB ssmltags[] = {