Windows CE port fixes/enhancements (from <Someone>)

A few other fixes:
- bug: text window does not scroll left on left arrow
- pcmain.c: fix warning: _fileno() returns void* in Windows CE SDK

3.5.0 only:
- files.c: compile error: don't include <signal.h> if NO_SIGNAL is defined. WinMo does not support POSIX signals
- version.c: compile error: append_port_id() is undeclared
- link error: mktime() is unsupported -> define it in celib.c

-<Someone>

sys/wince/mhtext.c

@@ -259,6 +259,10 @@ void LayoutText(HWND hWnd)
 LRESULT CALLBACK NHTextControlWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 {
 	switch(message) {
+	/* tell Windows not to process arrow keys (we want them) */
+	case WM_GETDLGCODE: 
+		return DLGC_WANTARROWS;
+
 	case WM_KEYDOWN:
 		switch( wParam ) {
 		case VK_SPACE: