tiff 4.5 removed private symbols/function that hylafax was never supposed to
used anyway - copy them from tiff 4.4 source.

https://gitlab.com/libtiff/libtiff/-/issues/504
Index: faxd/tif_fax3.h
--- faxd/tif_fax3.h.orig
+++ faxd/tif_fax3.h
@@ -57,13 +57,7 @@ typedef	void (*TIFFFaxFillFunc)(unsigned char*, tiff_r
 /*
  * The default run filler; made external for other decoders.
  */
-#if defined(__cplusplus)
-extern "C" {
-#endif
-extern	void _TIFFFax3fillruns(unsigned char*, tiff_runlen_t*, tiff_runlen_t*, tiff_runlen_t);
-#if defined(__cplusplus)
-}
-#endif
+void shopliftedfrom_TIFFFax3fillruns(unsigned char*, tiff_runlen_t*, tiff_runlen_t*, tiff_runlen_t);
 
 
 /* finite state machine codes */
