OpenSSL::Test: when moving directory, affect env as well
OpenSSL::Test: when moving directory, affect env as well

The environment variables TOP, SRCTOP, BLDTOP, ...  are used to affect
the testing framework.  However, subprocesses may want to use them as
well, and therefore need their values corrected when we move to a
different directory.

Reviewed-by: Emilia Käsper <6521fc25e7624eef7c3a0d89b71de7e612d27d37@openssl.org>

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl