Fix building of test/pbetest.c

Fix building of test/pbetest.c

The test_pkcs5_pbe() function is required twice:
once `if !defined OPENSSL_NO_RC4 && !defined OPENSSL_NO_MD5`
and once `if !defined OPENSSL_NO_DES && !defined OPENSSL_NO_SHA1`

Hence there should be `||` between those. Currently the build fails
if the first condition is false, while the second is true.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15432)