remove emsdk cache

emsdk-cache/emsdk-main/bazel/test_secondary_lto_cache/BUILD

@@ -1,19 +0,0 @@
-load("@emsdk//emscripten_toolchain:wasm_rules.bzl", "wasm_cc_binary")
-
-cc_binary(
-    name = "hello-world",
-    srcs = ["hello-world.cc"],
-    linkopts = [
-        "-sAUTO_NATIVE_LIBRARIES=0",
-        "-flto",
-    ],
-)
-
-wasm_cc_binary(
-    name = "hello-world-wasm",
-    cc_target = ":hello-world",
-    outputs = [
-        "hello-world.js",
-        "hello-world.wasm",
-    ],
-)