[gssapi/gssproxy] 325869: Move some configure checks out of a condition

[Simo Sorce]

Branch: refs/heads/main
  Home:   https://github.com/gssapi/gssproxy
  Commit: 325869a33cb923ab2123ab4179399a37503ed3b5
      https://github.com/gssapi/gssproxy/commit/325869a33cb923ab2123ab4179399a3750...
  Author: Simo Sorce 
  Date:   2022-05-31 (Tue, 31 May 2022)

Changed paths:
    M configure.ac

Log Message:
  -----------
  Move some configure checks out of a condition

I was too aggressive in moving all systemd checks, some of them need to
be performed at all times because there are conditionals ependent on the
detection.

The actual build for gss-only module is controlled by the BUILD_PROXY
guard anyway, so the checking unconditionally should not cause any
change for that configuration even when unused.

Signed-off-by: Simo Sorce