Fix a few more clang-generated warnings.

These are benign, I think. clang warns about casting non-pointer-sized
integers to pointers, but the Windows API actually does sometimes
involve values that are either pointers or _small_ integers, so in the
two cases involved I just cast through ULONG_PTR to silence the
warning. And clang insists that the integer whose address I give to
sk_getxdmdata is still uninitialised afterwards, which is just a lie.

windows/winctrls.c

@@ -76,7 +76,7 @@ HWND doctl(struct ctlpos *cp, RECT r,
     if (cp->hwnd) {
 	ctl = CreateWindowEx(exstyle, wclass, wtext, wstyle,
 			     r.left, r.top, r.right, r.bottom,
-			     cp->hwnd, (HMENU) wid, hinst, NULL);
+			     cp->hwnd, (HMENU)(ULONG_PTR)wid, hinst, NULL);
 	SendMessage(ctl, WM_SETFONT, cp->font, MAKELPARAM(TRUE, 0));
 
 	if (!strcmp(wclass, "LISTBOX")) {

windows/window.c

@@ -1543,7 +1543,8 @@ static void init_fonts(int pick_width, int pick_height)
 	if (cset == OEM_CHARSET)
 	    ucsdata.font_codepage = GetOEMCP();
 	else
-	    if (TranslateCharsetInfo ((DWORD *) cset, &info, TCI_SRCCHARSET))
+	    if (TranslateCharsetInfo ((DWORD *)(ULONG_PTR)cset,
+                                      &info, TCI_SRCCHARSET))
 		ucsdata.font_codepage = info.ciACP;
 	else
 	    ucsdata.font_codepage = -1;

x11fwd.c

@@ -934,7 +934,7 @@ int x11_send(struct X11Connection *xconn, char *data, int len)
          * Write a new connection header containing our replacement
          * auth data.
 	 */
-
+        socketdatalen = 0;             /* placate compiler warning */
         socketdata = sk_getxdmdata(xconn->s, &socketdatalen);
         if (socketdata && socketdatalen==6) {
             sprintf(new_peer_addr, "%d.%d.%d.%d", socketdata[0],