Add Unix port
Add c16x port
Add other ports too
coldfire port.patch #872 from David Haas
Removed sys_arch as this port uses the lwIP core only (raw API).
Moved msvc6 project files to contrib module.
Moved msvc6 project files to contrib module.
add unix projects to contrib module
----------------------------------------------------------------------
Fixed the following bugs:
	2366: For coldfire port: pbuf is freed twice when no room on
	      output ring.
	2368: Coldfire port: buffer cleanup in 5272 driver causes
	      problems.
	2376: Can't have timeouts large enough
Committing in .

Modified Files:
	coldfire/sys_arch.c coldfire/netif/5272fec.c
----------------------------------------------------------------------
----------------------------------------------------------------------
Fixed the following bugs:
	2366: For coldfire port: pbuf is freed twice when no room on
	      output ring.
	2368: Coldfire port: buffer cleanup in 5272 driver causes
	      problems.
	2376: Can't have timeouts large enough

Note that timeouts are now 32 bits. This was done for select()
support. Coldfire and unix ports have been updated.
Committing in .

Modified Files:
 	unix/sys_arch.c
Added lightweight protection. In coldfire this is implemented by disabling
interrupts. In unixsim this is implemented by using a mutex. Uses #define
SYS_LIGHTWEIGHT_PROT to enable. It is enabled in coldfire by default, but
disabled in unixsim.

Fixes bug 2005 if you enable SYS_LIGHTWEIGHT_PROT. So the bug is closed.
Example lwipopt file for coldfire
Add the following features and bugfixes:

Added select() functionality to sockets library.
Support for errno in sockets library.
Byte ordering fixes.
basic lwip_ioctl(), FIONREAD, get/setsockopt() etc. support

- added additional argument to netif_add to pass state pointer so that the
if_init function has access to context information before
the interface is added, without accessing globals.

- added netif_remove()

- to conserve cpu load the tcpip_tcp_timer should only be active
when tcbs that need it exist.

- pass length of available data to callbacks for NETCONN_EVT_RCV events

- added tcpip_link_input(), a hack to allow processing of PPP
packets in tcpip_thread() context. This saves threads and context
switches.

- renamed incompatible ASSERT() macro to LWIP_ASSERT() to avoid name
collision.

- changed a bunch of %d's to %u's in format strings for unsigned values.

- added ip_frag to lwip_stats.

- changed IP_REASS_MAXAGE and IP_REASS_TMO defaults to more realistic
values.

- added sys_timeout_remove() function to cancel timeouts (needed by PPP
amongst other things).

- tolerate NULL returns from sys_arch_timeouts() since some threads might
not need to use or have timeouts.

- added sys_sem_wait_timeout()

- moved mem_malloc() function to end of mem.c to work around tasking
compiler bug.

- automatically bind to local tcp port if 0.

- allow customization of port ranges for automatic local bindings.

- corrected various typos, spelling errors, etc..

Thanks to Marc Boucher for many of these changes.
put platform specific debug and assert in cc.h.Also put byte-order #define here.Delete files cpu.h,lib.h and init.h
Added commented code for upcoming merge with leon-dhcp.
list.h is gone remove #includes
sys_thread_new() now returns the thread (request from Marc Boucher).

Removed some unused .h files in coldfire port.

Support LWIP_DIAG and LWIP_ASSERT in coldfire (sort of).

Fix to last api fix to make sure select() is triggered, even when there has
been a FIN.

Allow build of unixsim from cygwin by specifying "make ARCH=cygwin" or from
linux by specifying "make ARCH=linux".
Fix some compile issues with both coldfire and unix builds.
Made sys_arch_prot() interface more generic by returning sys_prot_t instead
of u32_t.
Improvments I need for DEBUGF. Won't affect anyone else.