Kludge around duplicate code added in hw/xfree86/modes.
Code added in hw/xfree86/modes came from the server-1.3-branch. Portions of this code had previously been integrated into xf86Mode.c and edid_modes.c. To preserve hw/xfree86/modes as much as possible, the duplicate code from the other files has been disabled; a more careful review would figure out where that code actually belonged.
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