gnu-efi: Remove unneeded aarch64 patch

Not needed after the upgrade to 3.0.5. Yay!

pkgs/development/libraries/gnu-efi/aarch64-fix-discarded-qualifier.patch

@@ -1,13 +0,0 @@
-diff -ru gnu-efi-3.0.4-orig/lib/aarch64/initplat.c gnu-efi-3.0.4/lib/aarch64/initplat.c
---- gnu-efi-3.0.4-orig/lib/aarch64/initplat.c	2016-03-17 09:53:14.000000000 -0400
-+++ gnu-efi-3.0.4/lib/aarch64/initplat.c	2016-12-03 17:53:57.166575974 -0500
-@@ -41,7 +41,8 @@
- 
- void *memcpy(void *dest, const void *src, __SIZE_TYPE__ n)
- {
--    unsigned char *p = dest, *q = src;
-+    unsigned char *p = dest;
-+    const unsigned char *q = src;
- 
-     while (n--)
-         *p++ = *q++;

pkgs/development/libraries/gnu-efi/default.nix

@@ -9,8 +9,6 @@ stdenv.mkDerivation rec {
     sha256 = "08hb2gpzcj5p743wcagm0j2m4gh100xv12llpbjc13zi2icwv3xx";
   };
 
-  patches = optional stdenv.isAarch64 ./aarch64-fix-discarded-qualifier.patch;
-
   buildInputs = [ pciutils ];
 
   hardeningDisable = [ "stackprotector" ];