Revised VMS build (descrip.mms) and makefile

Revised VMS build to include new simulators and resolve other build issues

    Added AsyncIO support
    Fixed support for clean operation on VAX, AXP and IA64 and various VMS versions.

Cleaned up makefile to properly detect pcap and readline and cleanly build on all supported platforms which use the makefile:

   X86 (mix of 32bit & 64bit) gcc:
                                Linux
                                NetBSD
                                OpenBSD
                                FreeBSD
                                Solaris
                                OSX
   Sparc(big endian) gcc:
                                Linux
                                Solaris
2 files changed