fix(libtiff): add config file generation in meson.build

Copy tif_config.h and tiffconf.h from dist/ to libtiff/ at configure time.
Fixes missing header errors during SIDE_MODULE build.

Author: superstructor

meson.build

@@ -2,7 +2,16 @@ project('libtiff.wasm', 'c', version: '4.7.0', meson_version: '>=1.3.0')
 
 simd = get_option('simd')
 
-incs = include_directories('.', 'libtiff')
+# Copy config files from dist to libtiff (needed for build)
+fs = import('fs')
+if not fs.exists('libtiff/tif_config.h')
+  run_command('cp', 'dist/tif_config.h', 'libtiff/', check: true)
+endif
+if not fs.exists('libtiff/tiffconf.h')
+  run_command('cp', 'dist/tiffconf.h', 'libtiff/', check: true)
+endif
+
+incs = include_directories('.', 'libtiff', 'dist')
 
 tiff_sources = files(
   'libtiff/tif_aux.c','libtiff/tif_close.c','libtiff/tif_codec.c','libtiff/tif_color.c','libtiff/tif_compress.c','libtiff/tif_dir.c','libtiff/tif_dirinfo.c','libtiff/tif_dirread.c','libtiff/tif_dirwrite.c','libtiff/tif_dumpmode.c','libtiff/tif_error.c','libtiff/tif_extension.c','libtiff/tif_flush.c','libtiff/tif_getimage.c','libtiff/tif_luv.c','libtiff/tif_lzw.c','libtiff/tif_next.c','libtiff/tif_open.c','libtiff/tif_packbits.c','libtiff/tif_pixarlog.c','libtiff/tif_predict.c','libtiff/tif_print.c','libtiff/tif_read.c','libtiff/tif_strip.c','libtiff/tif_swab.c','libtiff/tif_thunder.c','libtiff/tif_tile.c','libtiff/tif_version.c','libtiff/tif_warning.c','libtiff/tif_write.c','libtiff/tif_zip.c'