signtool: Add bazel build rules

Bug: 387241522
Test: ./tools/bazel build @gbl//signtool:gblsigntool
Test: bazel-bin/external/gbl/signtool/gblsigntool --help
Test: ./tools/bazel run //bootable/libbootloader:gblsigntool_dist
Test: out/signtool/gblsigntool --help
(cherry picked from https://android-review.googlesource.com/q/commit:16d6fbf4098ddf196e536ded8e48b4699fff78a5)
Merged-In: Ie78515ded5a8db0a906c63b9bd42db1ba19efeb7
Change-Id: Ie78515ded5a8db0a906c63b9bd42db1ba19efeb7
3 files changed
tree: 69fc059a8861643654eda2abefb47acdc210d7d4
  1. gbl/
  2. libxbc/
  3. vts/
  4. .clang-format
  5. .gitignore
  6. BUILD
  7. LICENSE
  8. OWNERS