gestures: ignore -Wsizeof-array-div

Ignore the new warning that broke existing hack that casts
tp_custom_point_/mouse_custom_point_/tp_custom_scroll_ to float arrays.

BUG=chromium:1034792

TEST=local builds.

Change-Id: I9fb4578541ad1aeeba9d578943904d0083d7544d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/gestures/+/1970802
Reviewed-by: Caroline Tice <[email protected]>
Reviewed-by: Sean O'Brien <[email protected]>
Tested-by: Jian Cai <[email protected]>
Commit-Queue: Jian Cai <[email protected]>
1 file changed