Move build config table to separate files.

Move build config table to separate files.

Move the build configuration table into separate files.  The Configurations
file is standard configs, and Configurations.team is for openssl-team
members.  Any other file, Configurations*, found in the same directory
as the Configure script, is loaded.

To add another file, use --config=FILE flags (which should probably be
an absolute path).

Written by Stefen Eissing <stefan.eissing@greenbytes.de> and Rich Salz
<rsalz@openssl.org>, contributed by Akamai Technologies.

Reviewed-by: Richard Levitte <levitte@openssl.org>