crypto/openssl: remove autogenerated files

These files contain build host paths and other configuration details
that can be regenerated via the standard vendor import process. Don't
clutter up the FreeBSD tree with these files.

Add the paths to .gitignore to prevent them from accidentally being
added in a future update.

Approved by: re (cperciva)
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D53044

(cherry picked from commit d271d2ce152435b14e309bd8b25f47a0f4a2040f)
(cherry picked from commit 0d5ef734e91e6b03312b54ab3463ed5608ed27fa)