wolfSSL removed liboqs: Falcon is now provided natively by wolfCrypt, and
--with-liboqs is a deprecated no-op (configure.ac). A build therefore no
longer links liboqs, so recording it as an SBOM dependency is dead code and
the SBOM integration CI (which asserted a liboqs dep package) failed.
Remove the liboqs dependency throughout:
- scripts/gen-sbom: drop DEP_META['liboqs'] and the --dep-liboqs flag.
- Makefile.am / configure.ac: drop --dep-liboqs "$(ENABLED_LIBOQS)" and the
now-unused AC_SUBST([ENABLED_LIBOQS]).
- .github/workflows/sbom.yml: drop the liboqs install / --with-liboqs steps
and the liboqs dep assertion; keep the native-Falcon build so the
HAVE_FALCON build-property capture is still exercised.
- scripts/test_gen_sbom.py: drop the liboqs-specific tests, guard against
the key reappearing, and use openssl as the example dep elsewhere.
- doc/SBOM.md: drop the --dep-liboqs / liboqs dependency references.