How to update libzip:

Note: all commands below are run from the Chromium root directory (src/).
01. Prepare a fresh Chromium branch.
02. Navigate to https://github.com/nih-at/libzip/commits/main/ in a browser and
    choose a commit hash to update to and copy it.
03. Delete all of the existing libzip third_party code with:
    `rm -rf third_party/libzip/src/*`.
04. From the Chromium src/ directory, run
    ```
    curl -L https://github.com/nih-at/libzip/archive/<COMMIT_HASH>.tar.gz | \
    tar -xz -C third_party/libzip/src --strip-components=1
    ```
05. Unset executable bit for a script with
    `chmod 644 third_party/libzip/src/android/do.sh`. This is necessary because
    Chromium does not allow executable files without a shebang/ELF/Mach-O header.
06. Delete unneeded .github folder by running
    `rm -rf third_party/libzip/src/.github`.
07. Generate additional necessary code files by running this command from src/:
    ```
    cmake -S third_party/libzip/src -B /tmp/libzip_build && \
    cmake -DPROJECT_SOURCE_DIR=third_party/libzip/src \
          -P third_party/libzip/src/cmake/GenerateZipErrorStrings.cmake && \
    mv /tmp/libzip_build/config.h /tmp/libzip_build/zipconf.h zip_err_str.c \
       third_party/libzip/src/ && \
    rm -rf /tmp/libzip_build
    ```
    This command executes the following in order:
    a. Runs cmake to generate the additional files using a /tmp/ folder as a
       temporary build folder.
    b. Moves the files from the temporary build folder to libzip.
    c. Delete the temporary build folder.
08. Apply the patch by running
    `git apply third_party/libzip/patches/0001-patch-configs.patch`.
    This patch modifies the files generated in step 07 to handle Chromium's
    cross-platform builds.
09. Try building chrome with `autoninja`, using your typical `args.gn` setup.
    a. If the build fails with a `undefined symbol` error at the linking stage,
       the update likely contains a new file that needs to be added to
       `third_party/libzip/BUILD.gn`. Find the file containing the referenced
       symbol and add it to the BUILD.gn to fix.
    b. If the build fails with a `file required but not found` error, the update
       likely deleted a code file that needs to be removed in
       `third_party/libzip/BUILD.gn` as well. Remove the file in the BUILD.gn to
       fix.
10. Repeat step 9 until the build succeeds.
11. Update the `Date` and `Revision` line in third_party/libzip/README.chromium
    to match the update.
12. Commit the changes and upload to gerrit for review.