Remove support for Digital Mars compiler.

This compilers is not being developed any longer since many years, drop
support for it.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76547 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/regex.cpp

@@ -35,11 +35,8 @@
     #include "wx/crt.h"
 #endif //WX_PRECOMP
 
-// FreeBSD and DMars require this, CW doesn't have nor need it.
-// Others also don't seem to need it. If you have an error related to
-// (not) including <sys/types.h> please report details to
-// wx-dev@lists.wxwindows.org
-#if defined(__UNIX__) || defined(__DIGITALMARS__)
+// At least FreeBSD requires this.
+#if defined(__UNIX__)
 #   include <sys/types.h>
 #endif