fips: More elaborate way of getting FIPS pk flags indicators.
* src/fips.c (_gcry_fips_indicator_pk_flags): List more allowed string in the S-expression. * doc/gcrypt.texi: Add document for the FIPS service indicator GCRYCTL_FIPS_SERVICE_INDICATOR_PK_FLAGS with example.
- GnuPG-bug-id: T6417
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>