96a95bb5bf
* Mesa should depend_on('glproto')
The mesa package refers to `GL/glproto.h`. On systems that don't have
the OS packages installed, this leads to failures during the build
[e.g. this comment in
01482](https://github.com/spack/spack/pull/10482#issuecomment-488786745).
This fixes it. Tested on a minimally provisioned CentOS 7.
* Constrain glproto prereq to when +glx
* mesa: make glproto a build only dep
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