remove use_PIC.

The Emscripten bug that required this change was fixed.

see:
https://skia-review.googlesource.com/c/skia/+/243317
https://github.com/emscripten-core/emscripten/issues/9317

Change-Id: Id3f6395a795bf61ce3f48d73a8749899ad55ef8a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/259516
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
2 files changed