Remove cpp:default-toolchain

This was disabled in bazel 1.0 but there were still a lot of remnants
around.

bazelbuild#8546

src/main/java/com/google/devtools/build/lib/rules/cpp/CppOptions.java

@@ -888,17 +888,6 @@ public Label getPropellerOptimizeLabel() {
               + "actions. See https://github.com/bazelbuild/bazel/issues/8531")
   public boolean useSpecificToolFiles;
 
-  @Option(
-      name = "incompatible_disable_static_cc_toolchains",
-      defaultValue = "true",
-      documentationCategory = OptionDocumentationCategory.UNDOCUMENTED,
-      effectTags = {OptionEffectTag.LOADING_AND_ANALYSIS},
-      metadataTags = {OptionMetadataTag.INCOMPATIBLE_CHANGE},
-      help =
-          "@bazel_tools//tools/cpp:default-toolchain target was removed."
-              + "See https://github.com/bazelbuild/bazel/issues/8546.")
-  public boolean disableStaticCcToolchains;
-
   @Option(
       name = "incompatible_disable_nocopts",
       defaultValue = "true",
@@ -1200,7 +1189,6 @@ public FragmentOptions getHost() {
     host.requireCtxInConfigureFeatures = requireCtxInConfigureFeatures;
     host.useStandaloneLtoIndexingCommandLines = useStandaloneLtoIndexingCommandLines;
     host.useSpecificToolFiles = useSpecificToolFiles;
-    host.disableStaticCcToolchains = disableStaticCcToolchains;
     host.disableNoCopts = disableNoCopts;
     host.loadCcRulesFromBzl = loadCcRulesFromBzl;
     host.validateTopLevelHeaderInclusions = validateTopLevelHeaderInclusions;

src/test/shell/integration/loading_phase_test.sh

@@ -57,9 +57,6 @@ if "$is_windows"; then
   export MSYS2_ARG_CONV_EXCL="*"
 fi
 
-# Our tests use the static crosstool, so make it the default.
-# add_to_bazelrc "build --crosstool_top=@bazel_tools//tools/cpp:default-toolchain"
-
 output_base=$TEST_TMPDIR/out
 TEST_stderr=$(dirname $TEST_log)/stderr