Fix the issue when PYTHON_LIB_PATH consists of multiple paths

This fix tries to address the issue raise in 24567 where
PYTHON_LIB_PATH does not support specifying multiple paths
for bazel.

This fix update python_configure.bzl so that it is possible
to process multiple paths for PYTHON_LIB_PATH.

This fix fixes 24567.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>