Fix cmake generator

Fix cmake generator

PR #24678 modified some environment variables and locations that the
cmake exporter depended on, resulting in empty directory resolution.
Adjust build build.info and input variable names to match up again

Fixes #24874

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24877)