[bazel] Exclude lib/Interpreter/Wasm.h from //clang:interpreter

We're currently excluding Wasm.cpp, because it requires emscripten. When
using header modules, Wasm.h gets compiled on its own and it also
requires emscripten, so we need to exclude both.

Author: slackito

utils/bazel/llvm-project-overlay/clang/BUILD.bazel

@@ -1951,7 +1951,10 @@ cc_library(
             "lib/Interpreter/*.cpp",
             "lib/Interpreter/*.h",
         ],
-        exclude = ["lib/Interpreter/Wasm.cpp"],
+        exclude = [
+            "lib/Interpreter/Wasm.cpp",
+            "lib/Interpreter/Wasm.h",
+        ],
     ),
     hdrs = glob(["include/clang/Interpreter/*.h"]),
     includes = ["include"],