guix: remove unused patch

contrib/guix/patches/lief-fix-ppc64-nx-default.patch

@@ -1,29 +0,0 @@
-Correct default for Binary::has_nx on ppc64
-
-From the Linux kernel source:
-
-    * This is the default if a program doesn't have a PT_GNU_STACK
-    * program header entry. The PPC64 ELF ABI has a non executable stack
-    * stack by default, so in the absence of a PT_GNU_STACK program header
-    * we turn execute permission off.
-
-This patch can be dropped the next time we update LIEF.
-
-diff --git a/src/ELF/Binary.cpp b/src/ELF/Binary.cpp
-index a90be1ab..fd2d9764 100644
---- a/src/ELF/Binary.cpp
-+++ b/src/ELF/Binary.cpp
-@@ -1084,7 +1084,12 @@ bool Binary::has_nx() const {
-                                        return segment->type() == SEGMENT_TYPES::PT_GNU_STACK;
-                                      });
-   if (it_stack == std::end(segments_)) {
--    return false;
-+    if (header().machine_type() == ARCH::EM_PPC64) {
-+      // The PPC64 ELF ABI has a non-executable stack by default.
-+      return true;
-+    } else {
-+      return false;
-+    }
-   }
- 
-   return !(*it_stack)->has(ELF_SEGMENT_FLAGS::PF_X);