guix: remove GCC 10 workaround from NSIS

Based on Bitcoin PR #28370

contrib/guix/manifest.scm

@@ -178,11 +178,6 @@ chain for " target " development."))
       (home-page (package-home-page pthreads-xgcc))
       (license (package-license pthreads-xgcc)))))
 
-(define (make-nsis-for-gcc-10 base-nsis)
-  (package-with-extra-patches base-nsis
-    (search-our-patches "nsis-gcc-10-memmove.patch"
-                        "nsis-disable-installer-reloc.patch")))
-
 (define-public mingw-w64-base-gcc
   (package
     (inherit base-gcc)
@@ -348,7 +343,7 @@ chain for " target " development."))
     (cond ((string-suffix? "-mingw32" target)
            ;; Windows
            (list (make-mingw-pthreads-cross-toolchain "x86_64-w64-mingw32")
-                 (make-nsis-for-gcc-10 nsis-x86_64)))
+                 nsis-x86_64))
           ((string-contains target "-linux-")
            (list (make-bitcoin-cross-toolchain target)))
           ((string-contains target "darwin")

contrib/guix/patches/nsis-gcc-10-memmove.patch

@@ -1,23 +0,0 @@
-commit f6df41524e703dc471e283e566a48e05a735b7f2
-Author: Anders <anders_k@users.sourceforge.net>
-Date:   Sat Jun 27 23:18:45 2020 +0000
-
-    Don't let GCC 10 generate memmove calls (bug #1248)
-    
-    git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@7189 212acab6-be3b-0410-9dea-997c60f758d6
-
-diff --git a/SCons/Config/gnu b/SCons/Config/gnu
-index bfcb362d..21fa446b 100644
---- a/SCons/Config/gnu
-+++ b/SCons/Config/gnu
-@@ -103,6 +103,10 @@ stub_env.Append(LINKFLAGS = ['$NODEFLIBS_FLAG'])    # no standard libraries
- stub_env.Append(LINKFLAGS = ['$ALIGN_FLAG'])        # 512 bytes align
- stub_env.Append(LINKFLAGS = ['$MAP_FLAG'])          # generate map file
- 
-+conf = FlagsConfigure(stub_env)
-+conf.CheckCompileFlag('-fno-tree-loop-distribute-patterns')  # GCC 10: Don't generate msvcrt!memmove calls (bug #1248)
-+conf.Finish()
-+
- stub_uenv = stub_env.Clone()
- stub_uenv.Append(CPPDEFINES = ['_UNICODE', 'UNICODE'])
-