Add tools/build.sh to automatically apply XLA/GCC compatibility patches

[Phoebus-Liu]

Description

This PR fixes #4108 by adding a tools/build.sh convenience wrapper that automatically applies known compatibility patches before invoking run_in_docker.sh.

Problem

When building TF Serving from source with newer GCC versions (e.g., GCC 11/12/13), the build fails in external/local_xla/xla/shape.cc with:

error: function 'xla::Shape::Shape(xla::Shape&&)' defaulted on its redeclaration with an exception-specification that differs from the implicit exception-specification 'noexcept(false)'

This is caused by noexcept annotations on the move constructor/assignment that conflict with the implicit exception specification inferred by newer GCC/libstdc++.

Solution

• Add tools/build.sh which:
  1. Runs bazel fetch inside Docker to ensure external/ dependencies are present
  2. Applies sed patches to xla/shape.cc and xla/shape.h to remove the conflicting noexcept on move operations
  3. Forwards to tools/run_in_docker.sh for the actual build

Usage

./tools/build.sh -c opt tensorflow_serving/model_servers:tensorflow_model_server

Why not patch run_in_docker.sh directly?

run_in_docker.sh is a generic command runner. Adding build-specific patches there would couple the general Docker launcher to a specific dependency workaround. A dedicated build.sh is cleaner and avoids surprising users who run non-build commands.

Fixes

Fixes #4108

### Commit Message

```bash
git add tools/build.sh
git commit -m "Add build.sh wrapper to fix XLA/GCC noexcept compatibility

Adds a dedicated build wrapper that automatically applies sed patches
for the XLA Shape move-ctor noexcept mismatch seen with GCC 11+.
This avoids modifying the generic run_in_docker.sh tool.

Fixes #4108"