pseudo: Update to version 1.9.8

pseudo: Update to version 1.9.8

Changelog:
    Makefile.in: Bump to 1.9.8
    pseudo_client.h: Fix typo in the comment
    client: permissions drop setuid and setgid
    tests: Add setuid permission check
    pseudo_client.h: Add +s to PSEUDO_DB_MODE for mkdir
    tests: Add test that returned stat is correct
    pseudo_client.h: Make it clear both macros must be updated together
    Makefile.in: Add pseudo_client.h as a dependency

Signed-off-by: Mark Hatle <mark.hatle@kernel.crashing.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>