Revert "xfree86: os-support: move CONSOLE_X_BELL into bsd_bell.c"

This reverts commit 8958a99c02.
It broke the build of the xf86-input-keyboard driver, which relies
on CONSOLE_X_BELL in src/bsd_kbd.c.

Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1741>

hw/xfree86/os-support/bsd/bsd_bell.c

@@ -38,10 +38,6 @@
 #include "xf86_os_support.h"
 #include "xf86_OSlib.h"
 
-#ifndef CONSOLE_X_BELL
-#define CONSOLE_X_BELL _IOW('t',123,int[2])
-#endif
-
 void
 xf86OSRingBell(int loudness, int pitch, int duration)
 {

hw/xfree86/os-support/xf86_OSlib.h

@@ -195,6 +195,10 @@ struct pcvtid {
 #endif                          /* WSCONS_SUPPORT */
 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
 #include <sys/mouse.h>
+#endif
+    /* Include these definitions in case ioctl_pc.h didn't get included */
+#ifndef CONSOLE_X_BELL
+#define CONSOLE_X_BELL _IOW('t',123,int[2])
 #endif
 
 #define CLEARDTR_SUPPORT