remove unused __VA_ARGS__
remove unused __VA_ARGS__

The P macro is only ever called with one argument and Solaris cc
rightly emits E_ARGUEMENT_MISMATCH (yes, with the typo)

gquintard/Varnish-Cache,feld/Varnish-Cache,feld/Varnish-Cache,feld/Varnish-Cache,feld/Varnish-Cache,gquintard/Varnish-Cache,gquintard/Varnish-Cache,gquintard/Varnish-Cache,feld/Varnish-Cache