cpplib: EOF in pragmas

cpplib:  EOF in pragmas

This patch moves the generation of PRAGMA_EOF earlier, to when we set
need_line, rather than when we try and get the next line.  It also
prevents peeking past a PRAGMA token.

	libcpp/
	* lex.c (cpp_peek_token): Do not peek past CPP_PRAGMA.
	(_cpp_lex_direct): Handle EOF in pragma when setting need_line,
	not when needing a line.