busybox-w32: Enable UTF-8 in 64-bit builds

The x86 build supports Windows XP, but the x64 build supports no earlier
than Windows 7 (my personal favorite). Windows XP outright rejects EXEs
with a UTF-8 manifest, but Windows 7 simply ignores it. That permits GCC
to continue operating on Windows 7 with a UTF-8 manifest (as of GCC 13),
which must be disabled entirely in x86 builds for Windows XP. The same
can be done with busybox-w32 by disabling the UTF-8 check and gracefully
degrading to original "ANSI-only" behavior when the manifest is ignored.

Dockerfile

@@ -382,7 +382,7 @@ RUN /make-$MAKE_VERSION/configure \
 WORKDIR /busybox-w32
 COPY src/busybox-* $PREFIX/src/
 RUN cat $PREFIX/src/busybox-*.patch | patch -p1 \
- && make mingw64_defconfig \
+ && make mingw64u_defconfig \
  && sed -ri 's/^(CONFIG_AR)=y/\1=n/' .config \
  && sed -ri 's/^(CONFIG_ASCII)=y/\1=n/' .config \
  && sed -ri 's/^(CONFIG_DPKG\w*)=y/\1=n/' .config \

src/busybox-005-disable-utf8-check.patch

@@ -0,0 +1,8 @@
+Allow it to run without UTF-8 support, such as on Windows 7.
+--- a/libbb/appletlib.c
++++ b/libbb/appletlib.c
+@@ -1331,3 +1331,3 @@
+ #if ENABLE_PLATFORM_MINGW32
+-# if ENABLE_FEATURE_UTF8_MANIFEST
++# if ENABLE_FEATURE_UTF8_MANIFEST && 0
+ 	if (GetACP() != CP_UTF8) {

src/variant-x86.patch

@@ -39,3 +39,8 @@
          --disable-win32-registry \
 +        --disable-win32-utf8-manifest \
          --enable-mingw-wildcard \
+@@ -384,3 +389,3 @@
+ RUN cat $PREFIX/src/busybox-*.patch | patch -p1 \
+- && make mingw64u_defconfig \
++ && make mingw64_defconfig \
+  && sed -ri 's/^(CONFIG_AR)=y/\1=n/' .config \