vmodtool: Do not output the dummy return type VOID of constructors
vmodtool: Do not output the dummy return type VOID of constructors

generated VCL synopsis:

old:	new OBJ = VOID dyn(STRING addr, STRING port)
new:	new OBJ = dyn(STRING addr, STRING port)

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