Add support for disabling extensions through environment variables

Submitted by Vincent Untz `@vuntz`

Assigned to Xorg Project Team

Created attachment 59837 Add support for disabling extensions through environment variables

This is a patch we have in openSUSE for quite some time that makes it possible to disable an extension with an environment variable.

For instance: export XLIB_SKIP_EXT_MIT_SHM=1

This was apparently needed for some specific app crashing with some extension.

Patch was written by David Reveman.

~~Patch 59837~~, "Add support for disabling extensions through environment variables":
p_xlib_skip_ext_env.diff

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