Make libwebp.gyp respect order_profiling mode
Make libwebp.gyp respect order_profiling mode

Currently when order_profiling=1 build flag is set GN would instrument all
libwebp targets and produce the 'orderfile' containing libwebp functions.

This change brings the GYP build on par with GN build with respect to treating
the order_profiling flag. Reasons for having a special case in GYP are
historical and probably not relevant any more.

Performance impact on the GYP build will probably be negligible. It just feels
good to simplify things.

BUG=603618

Review URL: https://codereview.chromium.org/1889513005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#387564}

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