Disable incremental linking for proto_zero_plugin

This CL works around a linker bug that is seen when incrementally
linking proto_zero_plugin.exe after crrev.com/2756543002.

The linker bug also occurs in VS 2017 RTM so a new bug report to
Microsoft was made:
https://developercommunity.visualstudio.com/content/problem/34236/incremental-linking-creates-corrupt-executable.html

BUG=703251
[email protected]

Review-Url: https://codereview.chromium.org/2763233002
Cr-Commit-Position: refs/heads/master@{#458802}
1 file changed