[gssapi/gssproxy] add65e: Delay krb5 tracing setup in daemon mode

[Simo Sorce]

Branch: refs/heads/main
  Home:   https://github.com/gssapi/gssproxy
  Commit: add65e825283f3e34dd8652f565c343e8a605d9f
      https://github.com/gssapi/gssproxy/commit/add65e825283f3e34dd8652f565c343e8a...
  Author: Simo Sorce 
  Date:   2026-03-24 (Tue, 24 Mar 2026)

Changed paths:
    M src/gp_debug.c
    M src/gp_debug.h
    M src/gssproxy.c

Log Message:
  -----------
  Delay krb5 tracing setup in daemon mode

This delays the initialization of the krb5 tracing function until after
daemonization when not running interactively. Setting it up earlier caused the
trace reader thread to be killed during the fork. It also adds an early check
to cache the state of the KRB5_TRACE environment variable, ensuring that
gssproxy does not override or unset a user-provided trace configuration.

Signed-off-by: Simo Sorce

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