Use more compact AVIF_VERSION

This keeps us in sync with libgd. See libgd/libgd#723 .

Author: morsssss

ext/gd/libgd/gd_avif.c

@@ -343,7 +343,7 @@ gdImagePtr gdImageCreateFromAvifCtx (gdIOCtx *ctx)
 	decoder = avifDecoderCreate();
 
 	// Check if libavif version is >= 0.9.1
-#if AVIF_VERSION_MAJOR > 0 || (AVIF_VERSION_MAJOR == 0 && AVIF_VERSION_MINOR > 9) || (AVIF_VERSION_MAJOR == 0 && AVIF_VERSION_MINOR == 9 && AVIF_VERSION_PATCH >= 1)
+#if AVIF_VERSION >= 90100
 	// If so, allow the PixelInformationProperty ('pixi') to be missing in AV1 image
 	// items. libheif v1.11.0 or older does not add the 'pixi' item property to
 	// AV1 image items. (This issue has been corrected in libheif v1.12.0.)