Vendor libgomp in the manylinux Python wheel (#6461)

* Vendor libgomp in the manylinux2014_aarch64 wheel

* Use vault repo, since CentOS 6 has reached End-of-Life on Nov 30

* Vendor libgomp in the manylinux2010_x86_64 wheel

* Run verification step inside the container

tests/ci_build/CentOS-Base.repo

@@ -0,0 +1,37 @@
+[base]
+name=CentOS-$releasever - Base
+baseurl=http://vault.centos.org/centos/$releasever/os/$basearch/
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
+
+#released updates 
+[updates]
+name=CentOS-$releasever - Updates
+baseurl=http://vault.centos.org/centos/$releasever/updates/$basearch/
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
+
+#additional packages that may be useful
+[extras]
+name=CentOS-$releasever - Extras
+baseurl=http://vault.centos.org/centos/$releasever/extras/$basearch/
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
+
+#additional packages that extend functionality of existing packages
+[centosplus]
+name=CentOS-$releasever - Plus
+mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus&infra=$infra
+#baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
+gpgcheck=1
+enabled=0
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
+
+#contrib - packages by Centos Users
+[contrib]
+name=CentOS-$releasever - Contrib
+mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib&infra=$infra
+#baseurl=http://mirror.centos.org/centos/$releasever/contrib/$basearch/
+gpgcheck=1
+enabled=0
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6

tests/ci_build/Dockerfile.gpu_build_centos6

@@ -6,12 +6,13 @@ ARG CUDA_VERSION_ARG
 ENV DEBIAN_FRONTEND noninteractive
 ENV DEVTOOLSET_URL_ROOT http://vault.centos.org/6.9/sclo/x86_64/rh/devtoolset-4/
 
+COPY CentOS-Base.repo /etc/yum.repos.d/
+
 # Install all basic requirements
 RUN \
+    yum install -y epel-release && \
     yum -y update && \
-    yum install -y tar unzip wget xz git centos-release-scl yum-utils && \
-    yum-config-manager --enable centos-sclo-rh-testing && \
-    yum -y update && \
+    yum install -y tar unzip wget xz git patchelf && \
     yum install -y $DEVTOOLSET_URL_ROOT/devtoolset-4-gcc-5.3.1-6.1.el6.x86_64.rpm \
                    $DEVTOOLSET_URL_ROOT/devtoolset-4-gcc-c++-5.3.1-6.1.el6.x86_64.rpm \
                    $DEVTOOLSET_URL_ROOT/devtoolset-4-binutils-2.25.1-8.el6.x86_64.rpm \
@@ -20,6 +21,7 @@ RUN \
     # Python
     wget -O Miniconda3.sh https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh && \
     bash Miniconda3.sh -b -p /opt/python && \
+    /opt/python/bin/python -m pip install auditwheel && \
     # CMake
     wget -nv -nc https://cmake.org/files/v3.13/cmake-3.13.0-Linux-x86_64.sh --no-check-certificate && \
     bash cmake-3.13.0-Linux-x86_64.sh --skip-license --prefix=/usr && \
@@ -29,7 +31,7 @@ RUN \
     wget -nv -nc https://github.com/ninja-build/ninja/archive/v1.10.0.tar.gz --no-check-certificate && \
     tar xf v1.10.0.tar.gz && mv ninja-1.10.0 ninja && rm -v v1.10.0.tar.gz && \
     cd ninja && \
-    python ./configure.py --bootstrap
+    /opt/python/bin/python ./configure.py --bootstrap
 
 # NCCL2 (License: https://docs.nvidia.com/deeplearning/sdk/nccl-sla/index.html)
 RUN \

tests/ci_build/conda_env/aarch64_test.yml

@@ -27,3 +27,4 @@ dependencies:
 - pip:
   - shap
   - awscli
+  - auditwheel