Created separate tests directory for D1.

tests/d1/testincludes/std/compat.d

@@ -0,0 +1,10 @@
+module std.compat;
+
+extern (C) int printf(char *, ...);
+
+alias char[] string;
+alias wchar[] wstring;
+alias dchar[] dstring;
+
+alias Exception Error;
+alias bool      bit;