guix: remove GCC 10 workaround from NSIS

Fixed upstream in 3.06, see
kichik/nsis@229b613.
https://sourceforge.net/p/nsis/bugs/1248/

contrib/guix/manifest.scm

@@ -142,10 +142,6 @@ 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")))
-
 ;; While LIEF is packaged in Guix, we maintain our own package,
 ;; to simplify building, and more easily apply updates.
 ;; Moreover, the Guix's package uses cmake, which caused build
@@ -604,7 +600,7 @@ inspecting signatures in Mach-O binaries.")
            ;; Windows
            (list zip
                  (make-mingw-pthreads-cross-toolchain "x86_64-w64-mingw32")
-                 (make-nsis-for-gcc-10 nsis-x86_64)
+                 nsis-x86_64
                  nss-certs
                  osslsigncode))
           ((string-contains target "-linux-")