Allow using multiplatform images

This way we can provide not only images running on x86_64 but also aarch64.
The docker platform names are "linux/amd64" and "linux/arm64".

Fixes #78

Dockerfile.mri.erb

@@ -37,12 +37,12 @@ ENV BASH_ENV=/etc/rubybashrc
 ##
 <% if platform =~ /x64-mingw-ucrt/ %>
 COPY --from=larskanis/mingw64-ucrt:20.04 \
-    /build/binutils-mingw-w64-x86-64_2.34-6ubuntu1.3+8.8_amd64.deb \
-    /build/g++-mingw-w64-x86-64_9.3.0-17ubuntu1~20.04+22~exp1ubuntu4_amd64.deb \
-    /build/gcc-mingw-w64-base_9.3.0-17ubuntu1~20.04+22~exp1ubuntu4_amd64.deb \
-    /build/gcc-mingw-w64-x86-64_9.3.0-17ubuntu1~20.04+22~exp1ubuntu4_amd64.deb \
-    /build/mingw-w64-common_7.0.0-2_all.deb \
-    /build/mingw-w64-x86-64-dev_7.0.0-2_all.deb \
+    /build/binutils-mingw-w64-x86-64_*.deb \
+    /build/g++-mingw-w64-x86-64_*.deb \
+    /build/gcc-mingw-w64-base_*.deb \
+    /build/gcc-mingw-w64-x86-64_*.deb \
+    /build/mingw-w64-common_*.deb \
+    /build/mingw-w64-x86-64-dev_*.deb \
     /debs/
 RUN dpkg -i /debs/*.deb
 
@@ -57,6 +57,7 @@ if platform =~ /darwin/            %> clang python lzma-dev libxml2-dev libssl-d
 if platform =~ /aarch64-linux-gnu/ %> gcc-aarch64-linux-gnu g++-aarch64-linux-gnu <% end %><%
 if platform =~ /arm-linux-gnu/     %> gcc-arm-linux-gnueabihf g++-arm-linux-gnueabihf <% end %><%
 if platform =~ /x86-linux-gnu/     %> gcc-i686-linux-gnu g++-i686-linux-gnu <% end %><%
+if platform =~ /x86_64-linux-gnu/  %> gcc-x86-64-linux-gnu g++-x86-64-linux-gnu <% end %><%
 if platform =~ /x86-mingw32/       %> gcc-mingw-w64-i686 g++-mingw-w64-i686 <% end %><%
 if platform =~ /x64-mingw32/       %> gcc-mingw-w64-x86-64 g++-mingw-w64-x86-64 <% end %> && \
     rm -rf /var/lib/apt/lists/*
@@ -148,7 +149,7 @@ RUN bash -c " \
 RUN find /usr/local/rake-compiler/ruby/*linux*/ -name libruby.so | xargs rm
 RUN find /usr/local/rake-compiler/ruby/*linux*/ -name libruby-static.a | while read f ; do cp $f `echo $f | sed s/-static//` ; done
 RUN find /usr/local/rake-compiler/ruby/*linux*/ -name libruby.a | while read f ; do ar t $f | xargs ar d $f ; done
-RUN find /usr/local/rake-compiler/ruby/*linux*/ -name mkmf.rb | while read f ; do sed -i ':a;N;$!ba;s/TRY_LINK = [^\n]*\n[^\n]*\n[^\n]*LOCAL_LIBS)/& -lruby-static -lpthread -lrt -ldl <% if platform =~ /x86_64/ %> -lcrypt <% if platform !~ /musl/ %> -lz <% end %> <% end %>/' $f ; done
+RUN find /usr/local/rake-compiler/ruby/*linux*/ -name mkmf.rb | while read f ; do sed -i ':a;N;$!ba;s/TRY_LINK = [^\n]*\n[^\n]*\n[^\n]*LOCAL_LIBS)/& -lruby-static -lpthread -lrt -ldl/' $f ; done
 <% end %>
 
 <% if platform =~ /mingw/ %>

build/mk_osxcross.sh

@@ -13,7 +13,7 @@ set -x
 curl -L -o MacOSX11.1.sdk.tar.xz https://github.com/larskanis/MacOSX-SDKs/releases/download/11.1/MacOSX11.1.sdk.tar.xz
 tar -xf MacOSX11.1.sdk.tar.xz -C .
 cp -rf /usr/lib/llvm-10/include/c++ MacOSX11.1.sdk/usr/include/c++
-cp -rf /usr/include/x86_64-linux-gnu/c++/9/bits/ MacOSX11.1.sdk/usr/include/c++/v1/bits
+cp -rf /usr/include/*-linux-gnu/c++/9/bits/ MacOSX11.1.sdk/usr/include/c++/v1/bits
 tar -cJf MacOSX11.1.sdk.tar.xz MacOSX11.1.sdk
 
 set +x

mingw64-ucrt/Dockerfile

@@ -32,7 +32,7 @@ RUN cd mingw-w64-* && \
 
 # Install UCRT enabled deb-packages
 RUN dpkg -i mingw-w64-common_7.0.0-2_all.deb \
-    mingw-w64-tools_7.0.0-2_amd64.deb \
+    mingw-w64-tools_7.0.0-2_*.deb \
     mingw-w64-x86-64-dev_7.0.0-2_all.deb
 
 # Download gcc-binutils sources for mingw
@@ -52,6 +52,10 @@ RUN apt-get source gcc-mingw-w64 && \
     cd gcc-mingw-w64-* && \
     mk-build-deps -ir -t "apt-get -o Debug::pkgProblemResolver=yes -y --no-install-recommends"
 
+# Add version based alias
+RUN ln -s `which autoconf` `which autoconf`2.69 && \
+    ln -s `which autom4te` `which autom4te`2.69
+
 # Build gcc (only C and C++) based on UCRT headers and crt
 ADD gcc-mingw-w64-*.patch ./
 RUN cd gcc-mingw-w64-* && \