Update for newer bazel/lcm.

WORKSPACE

@@ -40,9 +40,9 @@ pkg_config_repository(
 http_archive(
     name = "lcm",
     build_file = "//tools:lcm.BUILD",
-    sha256 = "8bf90431eacb982cd8a7715ec566f0d94e1dbab849d0a7af1db45b384559935d",
-    strip_prefix = "lcm-a059d86deaca39d8c355a02da01b251fb62e3b80",
-    urls = ["https://github.com/lcm-proj/lcm/archive/a059d86deaca39d8c355a02da01b251fb62e3b80.tar.gz"],
+    sha256 = "8ea0076d2f2158fc750fec697b68c6903a9d70ccbe4e3f24240415a13445381f",  # noqa
+    strip_prefix = "lcm-91ce7a2ae46ad05f8a232f5fe32a06cccbead1c2",
+    urls = ["https://github.com/lcm-proj/lcm/archive/91ce7a2ae46ad05f8a232f5fe32a06cccbead1c2.tar.gz"],
 )
 
 java_import_external(

tools/lcm.BUILD

@@ -135,6 +135,7 @@ cc_binary(
         "lcmgen/emit_c.c",
         "lcmgen/emit_cpp.c",
         "lcmgen/emit_csharp.c",
+        "lcmgen/emit_go.c",
         "lcmgen/emit_java.c",
         "lcmgen/emit_lua.c",
         "lcmgen/emit_python.c",

tools/python.bzl

@@ -33,7 +33,6 @@ Arguments:
 """
 
 load("//tools:execute.bzl", "which")
-load("//tools:os.bzl", "determine_os")
 
 def _impl(repository_ctx):
     python_config = which(repository_ctx, "python{}-config".format(
@@ -83,18 +82,6 @@ def _impl(repository_ctx):
 
     linkopts_direct_link = list(linkopts)
 
-    os_result = determine_os(repository_ctx)
-    if os_result.error != None:
-        fail(os_result.error)
-
-    if os_result.is_macos:
-        for i in reversed(range(len(linkopts))):
-            if linkopts[i].find("python{}".format(
-                repository_ctx.attr.version,
-            )) != -1:
-                linkopts.pop(i)
-        linkopts = ["-undefined dynamic_lookup"] + linkopts
-
     file_content = """# -*- python -*-
 
 # DO NOT EDIT: generated by python_repository()
@@ -106,7 +93,11 @@ licenses(["notice"])  # Python-2.0
 # may be nested within `/usr/include/python2.7`, such as `numpy` when installed
 # via `apt` on Ubuntu.
 headers = glob(
-    ["include/*/*"],
+    [
+        "include/*/*",
+        "include/*/cpython/*",
+        "include/*/internal/*",
+    ],
     exclude_directories = 1,
 )