MFH: r468566 r469635

lang/python27: Fix build with LibreSSL 2.7

PR: 226883
Submitted by: Charlie Li <ml+freebsd vishwin info>
Approved by: python (koobs)
Differential Revision: https://reviews.freebsd.org/D14837

• Update to 2.7.15(include security fix)

PR: 228028
Submitted by: wen@(myself)
Exp-run by: antoine@