[bazel] Support .symbols extension in link_wrapper

Update link_wrapper.py and wasm_cc_binary.bzl to look for and allow
.symbols output extension instead of .js.symbols, matching emcc's
output naming scheme for symbol maps.

Fixes: #1092

bazel/emscripten_toolchain/link_wrapper.py

diff --git a/bazel/emscripten_toolchain/link_wrapper.py b/bazel/emscripten_toolchain/link_wrapper.py
index f5a923b..4e9a150 100644
--- a/bazel/emscripten_toolchain/link_wrapper.py
+++ b/bazel/emscripten_toolchain/link_wrapper.py
@@ -84,7 +84,7 @@
     '.wasm',
     '.wasm.map',
     '.data',
-    '.js.symbols',
+    '.symbols',
     '.wasm.debug.wasm',
     '.html',
     '.ts',

bazel/emscripten_toolchain/wasm_cc_binary.bzl

diff --git a/bazel/emscripten_toolchain/wasm_cc_binary.bzl b/bazel/emscripten_toolchain/wasm_cc_binary.bzl
index d0f21b1..84bc101 100644
--- a/bazel/emscripten_toolchain/wasm_cc_binary.bzl
+++ b/bazel/emscripten_toolchain/wasm_cc_binary.bzl
@@ -61,7 +61,7 @@
     ".wasm",
     ".wasm.map",
     ".data",
-    ".js.symbols",
+    ".symbols",
     ".wasm.debug.wasm",
     ".html",
     ".ts",
@@ -186,7 +186,7 @@
         "wasm": "{}/{}.wasm".format(name, basename),
         "map": "{}/{}.wasm.map".format(name, basename),
         "data": "{}/{}.data".format(name, basename),
-        "symbols": "{}/{}.js.symbols".format(name, basename),
+        "symbols": "{}/{}.symbols".format(name, basename),
         "dwarf": "{}/{}.wasm.debug.wasm".format(name, basename),
         "html": "{}/{}.html".format(name, basename),
     }

bazel/test_external/BUILD

diff --git a/bazel/test_external/BUILD b/bazel/test_external/BUILD
index 6fe7722..b8b7813 100644
--- a/bazel/test_external/BUILD
+++ b/bazel/test_external/BUILD
@@ -4,6 +4,7 @@
 cc_binary(
     name = "hello-world",
     srcs = ["hello-world.cc"],
+    linkopts = ["--emit-symbol-map"],
 )
 
 wasm_cc_binary(
@@ -12,6 +13,7 @@
     outputs = [
         "hello-world.js",
         "hello-world.wasm",
+        "hello-world.symbols",
     ],
 )
 

test/test_bazel.sh

diff --git a/test/test_bazel.sh b/test/test_bazel.sh
index f4699fe..3ba1c39 100755
--- a/test/test_bazel.sh
+++ b/test/test_bazel.sh
@@ -26,6 +26,7 @@
 
 pushd test_external
 bazel build //:hello-world-wasm
+test -f bazel-bin/hello-world.symbols
 bazel build //long_command_line:long_command_line_wasm
 bazel build //:hello-embind-wasm --compilation_mode dbg # debug