Windows: Drop patched mingw-binutils, upstream F31 has the fix

The mingw-binutils fix for LTO was backported upstream to Fedora 31
with https://bodhi.fedoraproject.org/updates/FEDORA-2019-3d381baace

Dockerfile.windows

@@ -6,10 +6,7 @@ ARG mono_version
 RUN if [ -z "${mono_version}" ]; then echo -e "\n\nargument mono-version is mandatory!\n\n"; exit 1; fi && \
     dnf -y install --setopt=install_weak_deps=False \
       mingw32-gcc mingw32-gcc-c++ mingw32-winpthreads-static mingw64-gcc mingw64-gcc-c++ mingw64-winpthreads-static yasm && \
-    dnf clean all && \
-    rpm -Uvh --force /root/files/mingw-binutils-generic-2.30-5.fc29.godot.x86_64.rpm \
-                     /root/files/mingw64-binutils-2.30-5.fc29.godot.x86_64.rpm \
-                     /root/files/mingw32-binutils-2.30-5.fc29.godot.x86_64.rpm
+    dnf clean all
 
 RUN git clone https://github.com/mono/mono --branch ${mono_version} --single-branch && \
     cd mono && git submodule update --init && \