scripts/build_manylinux_in_docker.sh: use CentOS Vault mirrors for EO…

…L CentOS 7

CentOS 7 is now EOL, so the manylinux2014 build is failing; see
pypa/manylinux#1641. Work around it by using the archive mirror.

Signed-off-by: Omar Sandoval <osandov@osandov.com>

scripts/build_manylinux_in_docker.sh

@@ -7,6 +7,10 @@ set -eux
 # Drop into a shell if something fails.
 trap 'if [ $? -ne 0 ]; then exec bash -i; fi' EXIT
 
+sed -i -e 's/mirrorlist/#mirrorlist/g' \
+	-e 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' \
+	/etc/yum.repos.d/CentOS-*
+
 yum install -y \
 	bzip2-devel \
 	libzstd-devel \