xfree86: #ifdef HAS_USL_VTS for switch_to under Solaris
switch_to() is only used from #ifdef HAS_USL_VTS code, place it inside ifdefs to to avoid unused static warning and compile error on systems without VT_ACTIVATE and VT_WAITACTIVE defines.
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switch_to() is only used from #ifdef HAS_USL_VTS code, place it inside ifdefs to to avoid unused static warning and compile error on systems without VT_ACTIVATE and VT_WAITACTIVE defines.