Suppress implicit-fallthrough warnings.

Bug: b/112564944
Test: build with global -Wimplicit-fallthrough
Change-Id: Ib04daba08bc450657ab8997959a25fe99d3c1d48
diff --git a/vulkan/vkjson/Android.bp b/vulkan/vkjson/Android.bp
index e387165..93620f4 100644
--- a/vulkan/vkjson/Android.bp
+++ b/vulkan/vkjson/Android.bp
@@ -7,6 +7,7 @@
     cflags: [
         "-Wall",
         "-Werror",
+        "-Wimplicit-fallthrough",
     ],
     cppflags: [
         "-std=c++11",
@@ -33,6 +34,7 @@
     cflags: [
         "-Wall",
         "-Werror",
+        "-Wimplicit-fallthrough",
     ],
     cppflags: [
         "-std=c++11",