Since C compilers on VMS (perhaps with gcc being the great exception)

do not quite follow the same rules as on Unix, we need to use the
FLAT_INC tweak to include the vendor-specific header files.

crypto/engine/hw_cswift.c

@@ -78,7 +78,11 @@
  * simply to keep the file sizes reasonable.
  * [Geoff]
  */
+#ifdef FLAT_INC
+#include "cswift.h"
+#else
 #include "vendor_defns/cswift.h"
+#endif
 
 static int cswift_init(void);
 static int cswift_finish(void);