meson.build: xxf86vm is not needed for -Dglx-direct=false
It is only used in src/glx/glxcmds.c and when GLX_DIRECT_RENDERING is defined. So only depend on it if GLX direct rendering is actually enabled.
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It is only used in src/glx/glxcmds.c and when GLX_DIRECT_RENDERING is defined. So only depend on it if GLX direct rendering is actually enabled.