agent: Minor cleanup of the TPM patches.
* configure.ac (AC_CHECK_HEADERS): Add tss2/tss.h. * agent/divert-tpm2.c: Print an error if that file is not available. * agent/Makefile.am (gpg_agent_SOURCES): Add tpm.h * agent/command.c (do_one_keyinfo): Replace xstrdup by xtrystrdup. * agent/protect.c (agent_get_shadow_info_type): Check error of xtrystrdup.
- Signed-off-by: Werner Koch <wk@gnupg.org>