guix: use uptream nsis-x86_64

Our patch is now used upstream.

contrib/guix/manifest.scm

@@ -189,9 +189,9 @@ chain for " target " development."))
       (home-page (package-home-page pthreads-xgcc))
       (license (package-license pthreads-xgcc)))))
 
-(define (make-nsis-with-sde-support base-nsis)
+(define (make-nsis-for-gcc-10 base-nsis)
   (package-with-extra-patches base-nsis
-    (search-our-patches "nsis-SConstruct-sde-support.patch")))
+    (search-our-patches "nsis-gcc-10-memmove.patch")))
 
 (define-public lief
   (package
@@ -630,7 +630,7 @@ inspecting signatures in Mach-O binaries.")
            ;; Windows
            (list zip
                  (make-mingw-pthreads-cross-toolchain "x86_64-w64-mingw32")
-                 (make-nsis-with-sde-support nsis-x86_64)
+                 (make-nsis-for-gcc-10 nsis-x86_64)
                  osslsigncode))
           ((string-contains target "-linux-")
            (list (cond ((string-contains target "riscv64-")

contrib/guix/patches/nsis-SConstruct-sde-support.patch

@@ -1,18 +0,0 @@
-https://github.com/kichik/nsis/pull/13
-https://sourceforge.net/p/nsis/code/7248/
-
-diff --git a/SConstruct b/SConstruct
-index e8252c9..41786f2 100755
---- a/SConstruct
-+++ b/SConstruct
-@@ -95,8 +95,8 @@ default_doctype = 'html'
- if defenv.WhereIs('hhc', os.environ['PATH']):
- 	default_doctype = 'chm'
- 
--from time import strftime, gmtime
--cvs_version = strftime('%d-%b-%Y.cvs', gmtime())
-+import time
-+cvs_version = time.strftime('%d-%b-%Y.cvs', time.gmtime(int(os.environ.get('SOURCE_DATE_EPOCH', time.time()))))
- 
- opts = Variables()
- 

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

@@ -0,0 +1,23 @@
+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'])
+