PR testsuite/82997
	* gcc.dg/cpp/macsyntx.c (var1, rest): Don't expect
	"requires at least one" warning.
	* gcc.dg/cpp/sysmac1.c (foo): Likewise.
	* gcc.dg/cpp/macsyntx2.c: New test.
	* gcc.dg/cpp/sysmac3.c: New test.
	* gcc.dg/cpp/sysmac3.h: New file.

From-SVN: r254857