heimdal: remove absolute path to pwd, replace patchPhase with postPa… (#347760)

  # (check-ldap) the bdb backend got deprecated in favour of mdb in openldap 2.5.0,

  #              but the heimdal tests still seem to expect bdb as the openldap backend.

  #              This might be fixed upstream in a future update.

  patchPhase = ''

    runHook prePatch

  postPatch = ''

    substituteInPlace tests/ldap/slapd-init.in \

      --replace 'SCHEMA_PATHS="' 'SCHEMA_PATHS="${openldap}/etc/schema '

      --replace-fail 'SCHEMA_PATHS="' 'SCHEMA_PATHS="${openldap}/etc/schema '

    substituteInPlace tests/ldap/check-ldap.in \

      --replace 'PATH=' 'PATH=${openldap}/libexec:${openldap}/bin:'

      --replace-fail 'PATH=' 'PATH=${openldap}/libexec:${openldap}/bin:'

    substituteInPlace tests/ldap/slapd.conf \

      --replace 'database	bdb' 'database mdb'

    runHook postPatch

      --replace-fail 'database	bdb' 'database mdb'

    substituteInPlace tests/kdc/check-iprop.in \

      --replace-fail '/bin/pwd' 'pwd'

  '';

  # (test_cc) heimdal uses librokens implementation of `secure_getenv` on darwin,