Fix compiler error with clang 19

This commit fixes the following compiler error.

src/PYLibPinyin.h:53:32: error: unknown type name 'FILE'
   53 |     gboolean exportUserPhrase (FILE *dictfile);
      |                                ^

src/PYLibPinyin.h

@@ -24,6 +24,7 @@
 #include <memory>
 #include <time.h>
 #include <glib.h>
+#include <stdio.h>
 
 typedef struct _pinyin_context_t pinyin_context_t;
 typedef struct _pinyin_instance_t pinyin_instance_t;