[Wconversion] Suppress warnings

Bug: 56258
Bug: 58162

Change-Id: I0c8b3b6daa6708120ca1d6f431df893d8e3a5ecf
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/glslang/+/422897
Reviewed-by: Petr Hosek <phosek@google.com>
1 file changed