log: Only install glib log handler if SPICE_DEBUG_LEVEL is set

Calling g_log_set_handler() is problematic as this means applications
using spice-server won't be able to use g_log_set_default_handler to
manage spice logging output themselves. Since this call is only needed
for backwards compatibility (so that calling g_log together with
SPICE_DEBUG_LEVEL set has the expected behaviour), we can install it
only when SPICE_DEBUG_LEVEL is set.
Then we should deprecate SPICE_DEBUG_LEVEL once and for all.

Acked-by: Frediano Ziglio <fziglio@redhat.com>

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