merge bitcoin#24599: remove mingw-w64 std::filesystem workaround

contrib/guix/libexec/prelude.bash

@@ -51,7 +51,7 @@ fi
 time-machine() {
     # shellcheck disable=SC2086
     guix time-machine --url=https://git.savannah.gnu.org/git/guix.git \
-                      --commit=ae03f401381e956c4c41b4cf495cbde964fa43d0 \
+                      --commit=34e9eae68c9583acce5abc4100add3d88932a5ae \
                       --cores="$JOBS" \
                       --keep-failed \
                       --fallback \

contrib/guix/manifest.scm

@@ -167,17 +167,13 @@ desirable for building Dash Core release binaries."
 (define (make-gcc-with-pthreads gcc)
   (package-with-extra-configure-variable gcc "--enable-threads" "posix"))
 
-;; Required to support std::filesystem for mingw-w64 target.
-(define (make-gcc-without-newlib gcc)
-  (package-with-extra-configure-variable gcc "--with-newlib" "no"))
-
 (define (make-mingw-pthreads-cross-toolchain target)
   "Create a cross-compilation toolchain package for TARGET"
   (let* ((xbinutils (cross-binutils target))
          (pthreads-xlibc mingw-w64-x86_64-winpthreads)
          (pthreads-xgcc (make-gcc-with-pthreads
                          (cross-gcc target
-                                    #:xgcc (make-gcc-without-newlib (make-ssp-fixed-gcc base-gcc))
+                                    #:xgcc (make-ssp-fixed-gcc base-gcc)
                                     #:xbinutils xbinutils
                                     #:libc pthreads-xlibc))))
     ;; Define a meta-package that propagates the resulting XBINUTILS, XLIBC, and