Enabling tif_jxl in libtiff

tiff_jxl.diff

Same license as https://gitlab.com/libtiff/libtiff/-/blob/fa1d6d787fc67a1eeb3abccb790b5bee969d424b/LICENSE.md

Copied tif_jxl.c and tif_jxl.h from gdal/frmts/gtiff and then applied these changes

--- a/libtiff/tif_codec.c
+++ b/libtiff/tif_codec.c
@@ -90,6 +90,8 @@
     {"ThunderScan", COMPRESSION_THUNDERSCAN, TIFFInitThunderScan},
     {"NeXT", COMPRESSION_NEXT, TIFFInitNeXT},
     {"JPEG", COMPRESSION_JPEG, TIFFInitJPEG},
+    {"JXL", COMPRESSION_JXL, TIFFInitJXL},
+    {"JXL_DNG_1_7", COMPRESSION_JXL_DNG_1_7, TIFFInitJXL},
     {"Old-style JPEG", COMPRESSION_OJPEG, TIFFInitOJPEG},
     {"CCITT RLE", COMPRESSION_CCITTRLE, TIFFInitCCITTRLE},
     {"CCITT RLE/W", COMPRESSION_CCITTRLEW, TIFFInitCCITTRLEW},
--- a/libtiff/tiffconf.h
+++ b/libtiff/tiffconf.h
@@ -84,6 +84,9 @@
 /* Support JPEG compression (requires IJG JPEG library) */
 #define JPEG_SUPPORT 1
 
+/* Support JPEG XL compression */
+#define JXL_SUPPORT 1
+
 /* Support JBIG compression (requires JBIG-KIT library) */
 /* #undef JBIG_SUPPORT */
 
--- a/libtiff/tiffiop.h	2024-12-30 21:05:14.000000000 +0000
+++ b/libtiff/tiffiop.h	2025-01-08 20:36:52.000000000 +0000
@@ -510,6 +510,9 @@
     extern int TIFFInitJPEG(TIFF *, int);
     extern int TIFFJPEGIsFullStripRequired(TIFF *);
 #endif
+#ifdef JXL_SUPPORT
+    extern int TIFFInitJXL(TIFF *, int);
+#endif
 #ifdef JBIG_SUPPORT
     extern int TIFFInitJBIG(TIFF *, int);
 #endif