Revert "add egl through swiftshader to unix builds"
Revert "add egl through swiftshader to unix builds"

This reverts commit 1df5520f507079c10e6bc345b42fb5b73f6e35a3.

Reason for revert: blocks g3, need supplement cl to land before pushing this one

Original change's description:
> add egl through swiftshader to unix builds
>
> To be submitted with g3 cl/438169003
>
> Change-Id: Idbdfc2e5b64d26a0dae9773fa08caabe4acf9147
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/525839
> Commit-Queue: Jorge Betancourt <63f45fa27f6ebe96d0924e755262c906d4cb18db@google.com>
> Auto-Submit: Jorge Betancourt <63f45fa27f6ebe96d0924e755262c906d4cb18db@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Florin Malita <fmalita@google.com>
> Commit-Queue: Florin Malita <fmalita@google.com>

Change-Id: I6ab6fd6c583d4901c4e71845e0bf4d431b55644f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/525840
Bot-Commit: Rubber Stamper <d516c4cc2192058ab8dae3d306acbdaf2ce6574f@appspot.gserviceaccount.com>
Commit-Queue: Jorge Betancourt <63f45fa27f6ebe96d0924e755262c906d4cb18db@google.com>

google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia