[Wconversion] Suppress warnings
Bug: 56258
Bug: 58162

Change-Id: I31b17ae563b1f970a458fa4398de22dcbeb7e587
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/icu/+/422716
Reviewed-by: Petr Hosek <phosek@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index 3c0b593..6498fc4 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -127,6 +127,7 @@
       # https://unicode-org.atlassian.net/projects/ICU/issues/ICU-20869
       # is fixed.
       "-Wno-implicit-int-float-conversion",
+      "-Wno-conversion",
     ]
   }
   # </fuchsia-icu>