libpam: mark debug output functions as potentially unused

Marking the functions _pam_output_debug and _pam_output_debug_info as
potentially unused reduces the noise when compiling in debug mode.

The warning is produced whenever _pam_macros.h is included, but no
debug output is produced by the module. Just marking the function
as static inline, which would have a similar effect, does not work
for various reasons and instead produces new issues instead.

Thus silencing this warning by telling the compiler about our intentions
with these functions is the better approach.

Signed-off-by: Benny Baumann <BenBE@geshi.org>

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