meson.build: fix missing dependencies in xorg-server.pc
xorg-server.pc missed a few dependencies, so consumers might not get them and break build.
Signed-off-by: Enrico Weigelt, metux IT consult info@metux.net
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xorg-server.pc missed a few dependencies, so consumers might not get them and break build.
Signed-off-by: Enrico Weigelt, metux IT consult info@metux.net