Use 32bit longs on Alpha as well, because that's what the VMS

assembler code works with.

Of course, the assembler code could differ between platforms.  That
might happen in the future.

makevms.com

@@ -280,8 +280,8 @@ $!
 $   WRITE H_FILE "#if defined(HEADER_BN_H)"
 $   WRITE H_FILE "#undef SIXTY_FOUR_BIT_LONG"
 $   WRITE H_FILE "#undef SIXTY_FOUR_BIT"
-$   WRITE H_FILE "#define SIXTY_FOUR_BIT"
 $   WRITE H_FILE "#undef THIRTY_TWO_BIT"
+$   WRITE H_FILE "#define THIRTY_TWO_BIT"
 $   WRITE H_FILE "#undef SIXTEEN_BIT"
 $   WRITE H_FILE "#undef EIGHT_BIT"
 $   WRITE H_FILE "#endif"