Configure/Makefile: use the correct openssl app for FIPS installation
The `openssl` app was previously called without a path, which
would generally invoke the system's copy of the openssl application.
Currently, that's most likely an openssl version 1.1.1 application,
which does not recognize the `fipsinstall` command and terminates
with an error message.
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13684)