New Mojom parser: Remove dependency on CGO.

mojo/go/rules.gni

Index: mojo/go/rules.gni
diff --git a/mojo/go/rules.gni b/mojo/go/rules.gni
index 50e5c234484826bd84175faf7fadd43b20fd04a7..c2cbaa57de9efc2e5b0b31360a1c509eff9791ff 100644
--- a/mojo/go/rules.gni
+++ b/mojo/go/rules.gni
@@ -101,6 +101,8 @@ template("go_test_binary") {
              "-L" + rebase_path(target_out_dir) + " -l" + static_library_name +
                  " -lstdc++ -lpthread -lm -lglib-2.0 -lrt",
              "test",
+             "-tags",
+             "include_mojo_cgo",
              "-c",
            ] + rebase_path(invoker.sources, build_dir)
   }
@@ -249,6 +251,8 @@ template("go_mojo_application") {
       "-I" + rebase_path("//"),
       "-L" + rebase_path(target_out_dir) + " -l" + static_library_name + "",
       "build",
+      "-tags",
+      "include_mojo_cgo",
     ]
     args += [ "-buildmode=c-shared" ]
     args += rebase_path(invoker.sources, build_dir)