This change bumps Python3 version to 3.7.1.
Patch `002-fix-implicit-dh-free-declaration.patch` is now included in
upstream.
This also fixes CVE-2018-1061.
https://www.cvedetails.com/cve/CVE-2018-1061/
Compile & run-tested on x86.
Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>