Ignore file case mismatches for Windows goma builds (#375)
Ignore file case mismatches for Windows goma builds (#375)

Apparently goma builds don't preserve file case, causing lots of warnings about non-portable include paths. This eliminates ~249,000 warnings for the Windows Host Engine builds, making the log file several orders of magnitude smaller and making it usable when opened in the browser.

Addresses most of flutter/flutter#59199
flutter/buildroot,flutter/buildroot,flutter/buildroot,flutter/buildroot