Replace CVT implementation with libxcvt

Olivier Fourdan requested to merge ofourdan/xserver:libxcvt into master

libxcvt is a library providing a standalone version of the X server implementation of the VESA CVT standard timing modelines generator.

libxcvt also provides a standalone version of the command line tool cvt copied from the Xorg implementation and is meant to be a direct replacement to the version provided by the Xorg server.

libcvt can currently be found here:

#1142 (closed)

Edited by Olivier Fourdan

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