Update fskit.rb (#4053)

Once again removing references to my repositories; in theory this shouldn't change anything but it should be tested.

packages/fskit.rb

@@ -23,9 +23,7 @@ class Fskit < Package
   depends_on 'attr'
 
   def self.patch
-    system "wget", "https://github.com/JL2210/patches/raw/06346b89275a12eaa3fb71fce88a97dd288fa09d/fskit-dd9a8-xattr.patch"
-    abort 'Checksum mismatch. :/ Try again.'.lightred unless Digest::SHA256.hexdigest( File.read('fskit-dd9a8-xattr.patch') ) == 'bd221435060b92ecd237d2d90e4758a26acb02bbfa737c36b9ea0d4fe0d3c77a'
-    system "patch -Np1 -i fskit-dd9a8-xattr.patch"
+    system "sed -i 's,#include <attr/xattr\.h>,#include <attr/attributes.h>\n#include <sys/xattr.h>,g' include/fskit/*.h"
   end
 
   def self.build