tests/qapi-schema: Correct two 'if' conditionals

tests/qapi-schema: Correct two 'if' conditionals

A definition's conditional should imply the conditionals of types it
uses.  If it doesn't, some configurations won't compile.

Example (from tests/qapi-schema/qapi-schema-test.json):

    { 'union': 'TestIfUnion', 'data':
      { 'foo': 'TestStruct',
	'bar': { 'type': 'str', 'if': 'TEST_IF_UNION_BAR'} },
      'if': { 'all': ['TEST_IF_UNION', 'TEST_IF_STRUCT'] } }

    { 'command': 'test-if-union-cmd',
      'data': { 'union-cmd-arg': 'TestIfUnion' },
      'if': 'TEST_IF_UNION' }

generates

    #if (defined(TEST_IF_UNION)) && (defined(TEST_IF_STRUCT))
    typedef struct TestIfUnion TestIfUnion;
    #endif /* (defined(TEST_IF_UNION)) && (defined(TEST_IF_STRUCT)) */

and

    #if defined(TEST_IF_UNION)
    void qmp_test_if_union_cmd(TestIfUnion *union_cmd_arg, Error **errp);
    void qmp_marshal_test_if_union_cmd(QDict *args, QObject **ret, Error **errp);
    #endif /* defined(TEST_IF_UNION) */

which doesn't compile when !defined(TEST_IF_STRUCT).

Messed up in f8c4fdd6ae "tests/qapi: Cover commands with 'if' and
union / alternate 'data'", v4.0.0.  Harmless, as we don't actually use
this configuration.  Correct it anyway, along with another instance.

This loses coverage for 'not'.  The next commit will bring it back.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20210831123809.1107782-4-armbru@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>