* cppexp.c: Delete SKIP_OPERAND. Correct priority

	PAREN_INNER_PRIO.
	(_cpp_parse_expr): Check for multiple unary +/- operators.
	Correct priorities of ':' and '?'.  Treat ')' as having a
	value.	Ensure conditional expression is not void.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@32848 138bc75d-0d04-0410-961f-82ee72b054a4