Update ML Build Docker container to use hermetic C++

PiperOrigin-RevId: 814816242

ci/official/containers/ml_build/Dockerfile

@@ -12,14 +12,6 @@ COPY builder.packages.txt /builder.packages.txt
 
 RUN /setup.sources.sh && /setup.packages.sh /builder.packages.txt
 
-# Install devtoolset-9 in /dt9 with glibc 2.17 and libstdc++ 4.8, for building
-# manylinux2014-compatible packages.
-COPY builder.devtoolset/fixlinks.sh /fixlinks.sh
-COPY builder.devtoolset/rpm-patch.sh /rpm-patch.sh
-COPY builder.devtoolset/build_devtoolset.sh /build_devtoolset.sh
-COPY builder.devtoolset/glibc2.17-inline.patch /glibc2.17-inline.patch
-RUN /build_devtoolset.sh devtoolset-9 /dt9
-
 # Setup Python
 COPY setup.python.sh /setup.python.sh
 COPY builder.requirements.txt /builder.requirements.txt

ci/official/containers/ml_build/builder.packages.txt

@@ -1,28 +1,9 @@
-# Packages to be installed for the new Docker image.
-
-# Packages needed to build devtoolset
-file
-flex
-g++
-make
-patch
-rpm2cpio
-unar
-wget
-xz-utils
-cpio
-
 # Other build-related tools
 apt-transport-https
 autoconf
 automake
 build-essential
 ca-certificates
-llvm-18
-clang-18
-clang-tidy-18
-lld-18
-clang-format-12
 curl
 git
 parallel
@@ -32,4 +13,5 @@ unzip
 zip
 openjdk-21-jdk
 vim
+wget
 jq

ci/official/containers/ml_build/setup.python.sh

@@ -45,16 +45,6 @@ fi
 
 /setup.packages.sh pythons.txt
 
-# Re-link pyconfig.h from x86_64-linux-gnu into the devtoolset directory
-# for any Python version present
-pushd /usr/include/x86_64-linux-gnu
-for f in $(ls | grep python); do
-  # set up symlink for devtoolset-9
-  rm -f /dt9/usr/include/x86_64-linux-gnu/$f
-  ln -s /usr/include/x86_64-linux-gnu/$f /dt9/usr/include/x86_64-linux-gnu/$f
-done
-popd
-
 # Python 3.10 include headers fix:
 # sysconfig.get_path('include') incorrectly points to /usr/local/include/python
 # map /usr/include/python3.10 to /usr/local/include/python3.10