fix: ninja setup and sync simple examples

[novas0x2a]

ninja and make fit roughly into the same category of build system, but
we were only setting up the C build variables for make. This finishes
the ninja implementation to match make (more or less) and then syncs the
simple examples to match. The simple examples that don't already have
compiler integrations (i.e. make and ninja) now use the same wrapper,
which loads data from the configured toolchain instead of calling PATH
binaries.

All of the simple examples now work on windows, too.

[novas0x2a]

Note that this depends on #1474 so I've set the branch target to that.

[Copilot]

Pull request overview

This PR completes the ninja rule’s toolchain/environment setup to more closely match make, and updates the “simple” examples to use a shared compiler/archive wrapper so they work consistently across platforms (including Windows).

Changes:

• Add a shared create_ninja_script() implementation that reuses the existing make env-var/toolchain plumbing.
• Update foreign_cc/ninja.bzl to use toolchain-derived tools/flags/env vars when generating build commands.
• Sync simple examples to use a shared cc_wrapper.sh rather than calling PATH binaries directly.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
foreign_cc/private/ninja_script.bzl	New script generator for Ninja builds using the existing make env-var/toolchain machinery.
foreign_cc/private/BUILD.bazel	Exposes ninja_script.bzl as a bzl_library.
foreign_cc/ninja.bzl	Switches Ninja script generation to use toolchain tools/flags and the new shared script builder.
foreign_cc/BUILD.bazel	Wires new bzl deps for the updated Ninja rule.
examples/cc_wrapper.sh	Adds a shared compiler/static-link wrapper for the simple examples.
examples/BUILD.bazel	Exports the shared cc_wrapper.sh from the //examples package.
examples/ninja_simple/**	Removes the old clang wrapper and updates Ninja example to use the shared wrapper.
examples/make_simple/**	Removes the old wrapper and updates Makefile + rule env to use the shared wrapper.
examples/meson_simple/**	Removes the now-unused clang wrapper wiring from the Meson example.

Comments suppressed due to low confidence (1)

examples/make_simple/BUILD.bazel:19

• After removing cxx_wrapper.sh, the package //make_simple/code still exports that file (see examples/make_simple/code/BUILD.bazel). That will make this example fail to load. Remove the exports_files entry (or keep/provide the exported file).

    lib_source = "//make_simple/code:srcs",
    out_data_dirs = ["share"],
    out_static_libs = ["liba.a"],

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