Windows CE support : using standard _WIN32_WCE flag instead of WINCE

- when compiling for Windows CE, a C++ project must define the preprocessor definitions: UNDER_CE=$(CEVersion),_WIN32_WCE=$(CEVersion)
- choosing the "_WIN32_CE" form for uniformization with "_WIN32" and "_WIN32_WINNT" already used in libzmq (boost is using both forms)
- see http://msdn.microsoft.com/en-us/library/ee479161(v=winembedded.60).aspx

builds/msvc/errno.cpp

-#if defined WINCE
+#if defined _WIN32_WCE
 
 //#include "..\..\include\zmq.h"
 #include "..\..\src\err.hpp"

include/zmq.h

@@ -27,7 +27,7 @@
 extern "C" {
 #endif
 
-#if !defined WINCE
+#if !defined _WIN32_WCE
 #include <errno.h>
 #endif
 #include <stddef.h>

src/clock.cpp

@@ -27,7 +27,7 @@
 #include <stddef.h>
 
 #if defined _MSC_VER
-#if defined WINCE
+#if defined _WIN32_WCE
 #include <cmnintrin.h>
 #else
 #include <intrin.h>

src/err.cpp

@@ -203,7 +203,7 @@ const char *zmq::wsa_error_no (int no_)
 void zmq::win_error (char *buffer_, size_t buffer_size_)
 {
     DWORD errcode = GetLastError ();
-#if defined WINCE
+#if defined _WIN32_WCE
     DWORD rc = FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM |
         FORMAT_MESSAGE_IGNORE_INSERTS, NULL, errcode, MAKELANGID(LANG_NEUTRAL,
         SUBLANG_DEFAULT), (LPWSTR)buffer_, buffer_size_ / sizeof(wchar_t), NULL );

src/err.hpp

@@ -26,7 +26,7 @@
 #include "../include/zmq.h"
 
 #include <assert.h>
-#if defined WINCE
+#if defined _WIN32_WCE
 #include "..\builds\msvc\errno.hpp"
 #else
 #include <errno.h>

src/socket_base.cpp

@@ -29,7 +29,7 @@
 #if defined ZMQ_HAVE_WINDOWS
 #include "windows.hpp"
 #if defined _MSC_VER
-#if defined WINCE
+#if defined _WIN32_WCE
 #include <cmnintrin.h>
 #else
 #include <intrin.h>

src/thread.cpp

@@ -43,7 +43,7 @@ void zmq::thread_t::start (thread_fn *tfn_, void *arg_)
 {
     tfn = tfn_;
     arg =arg_;
-#if defined WINCE
+#if defined _WIN32_WCE
     descriptor = (HANDLE) CreateThread (NULL, 0,
         &::thread_routine, this, 0 , NULL);
 #else

src/windows.hpp

@@ -170,7 +170,7 @@
 
 #include <ws2tcpip.h>
 #include <ipexport.h>
-#if !defined WINCE
+#if !defined _WIN32_WCE
 #include <process.h>
 #endif