On linux use <termios.h> instead of <termio.h>

<termio.h> is obsolete. Using <termios.h> instead fixes building with
musl libc.

Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Felix Janda <felix.janda@posteo.de>

hw/xfree86/os-support/xf86_OSlib.h

@@ -183,11 +183,7 @@ extern _X_HIDDEN char xf86SolarisFbDev[PATH_MAX];
 #include <sys/types.h>
 #include <assert.h>
 
-#ifdef __linux__
-#include <termio.h>
-#else                           /* __GLIBC__ */
 #include <termios.h>
-#endif
 #ifdef __sparc__
 #include <sys/param.h>
 #endif