* lib/compat.exp, gcc.dg/compat/struct-layout-1.exp,
	g++.dg/compat/struct-layout-1.exp: Use .exe extension for compat
	test executables.
	* gcc.dg/compat/struct-layout-1_generate.c,
	g++.dg/compat/struct-layout-1_generate.c: Convert backslash to
	slash in srcdir for dg-options string.

From-SVN: r140299