webkit2gtk: portable little endian check

this silences a potential problem on musl

srcpkgs/webkit2gtk/patches/le-check.patch

@@ -0,0 +1,26 @@
+From ef8f9a0b61509401e64c717c7cc6f025f1b49300 Mon Sep 17 00:00:00 2001
+From: q66 <daniel@octaforge.org>
+Date: Mon, 4 Jan 2021 19:12:25 +0100
+Subject: [PATCH] portable little endian check
+
+---
+ Source/ThirdParty/xdgmime/src/xdgmimemagic.c | 3 +--
+ 1 file changed, 1 insertion(+), 2 deletions(-)
+
+diff --git Source/ThirdParty/xdgmime/src/xdgmimemagic.c Source/ThirdParty/xdgmime/src/xdgmimemagic.c
+index 3a62b9d..9bd4e1d 100644
+--- Source/ThirdParty/xdgmime/src/xdgmimemagic.c
++++ Source/ThirdParty/xdgmime/src/xdgmimemagic.c
+@@ -485,8 +485,7 @@ _xdg_mime_magic_parse_magic_line (FILE              *magic_file,
+ 	      _xdg_mime_magic_matchlet_free (matchlet);
+ 	      return XDG_MIME_MAGIC_ERROR;
+ 	    }
+-	  /* FIXME: need to get this defined in a <config.h> style file */
+-#if LITTLE_ENDIAN
++#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+ 	  for (i = 0; i < matchlet->value_length; i = i + matchlet->word_size)
+ 	    {
+ 	      if (matchlet->word_size == 2)
+-- 
+2.30.0
+