Revert "Remove an obsolete workaround from .bazelrc"

This reverts commit de7615f.

It turns out that --cpu command line option will be silently ignored
with Bazel 7.0 and later unless

  --noincompatible_enable_cc_toolchain_resolution

option is specified [1]. Otherwise 'mozc_tip32.dll' will be built as
a 64-bit executable.

This is a temporary workaround until until we fully migrate to

--platforms

command line option [2].

This commit only affects Windows build with Bazel. Other build
configurations such as GYP build on Windows are not affected.

Closes google#1102.

 [1]: bazelbuild/bazel#7260
 [2]: https://bazel.build/concepts/platforms

src/.bazelrc

@@ -65,6 +65,12 @@ test:macos_env   --test_tag_filters=-nomac
 build:windows_env --build_tag_filters=-nowin
 test:windows_env   --test_tag_filters=-nowin
 
+# A temporary workaround to make "mozc_win_build_rule" work.
+# Note that "incompatible_enable_cc_toolchain_resolution" is now enabled by
+# default. See https://github.com/bazelbuild/bazel/issues/7260
+# TODO: Re-enable "incompatible_enable_cc_toolchain_resolution"
+build:windows_env --noincompatible_enable_cc_toolchain_resolution
+
 # Android specific options
 build:android_env --copt "-DOS_ANDROID"
 build:android_env --build_tag_filters=-noandroid