Print a list of one or more structure declarations, separated by spaces.
(print-structdecl-list structdecls pstate) → new-pstate
As mentioned in print-strunispec, for now we print all of them in one line, since a structure or union specifier may occur in the middle of a list of declaration specifiers, but we plan to print these in multiple lines, at least under certain conditions (e.g. when the structure or union specifier is at the top level.