Fix ARMv6 Linux cross-build

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index b33351bc992e8b17efbb936797bb2a3ca8052a0c..75fb9dc915228949bc6f8829163eb6b1610a4652 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -556,6 +556,12 @@ if (is_win) {
     default_warning_flags += [ "-Wno-psabi" ]
   }
 
+  # The Raspberry Pi 1 toolchain enables this warning, but Dart doesn't build
+  # cleanly with it.
+  if (is_linux && !is_clang && current_cpu == "arm" && arm_version == 6) {
+    default_warning_flags += [ "-Wno-type-limits" ]
+  }
+
   if (is_android) {
     # Disable any additional warnings enabled by the Android build system but
     # which chromium does not build cleanly with (when treating warning as