android_webview: avoid depending on locale at gyp time.

To keep the generated makefiles relatively stable, we sort a number of
file lists at gyp time, but this sort ordering is dependent on the
calling user's locale. Fix this by forcing LC_COLLATE to "C" in
gyp_webview.

BUG=
NOTRY=true

Review URL: https://codereview.chromium.org/649633002

Cr-Commit-Position: refs/heads/master@{#299103}

android_webview/tools/gyp_webview

@@ -15,6 +15,10 @@ echo "Generating makefiles for $PLATFORM"
 
 export PYTHONDONTWRITEBYTECODE=1
 
+# Override the calling user's locale sort order as this affects the generated
+# makefiles.
+export LC_COLLATE=C
+
 CHROME_SRC="$(readlink -f "$(dirname "$0")/../..")"
 GYP="${CHROME_SRC}/build/gyp_chromium"