Add external testing with oqsprovider

Including running the oqsprovider external test in the
CI external test build.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17832)

1 files changed, 0 insertions, 0 deletions

diff --git a/oqs-provider b/oqs-provider
new file mode 160000
+Subproject e422884c2387006f68f4c192b3dcb6be3160e7d