guest GL libs: rebuild for protocol 13

HeyPuter/gex

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The committed drivers (guest/gl/out and web/public/fs: musl, glibc and
x86-64) were last built at 3ca92191. That was before fd5b970f raised
GEXGL_PROTOCOL_VERSION to 13, so they still sent protocol 12. web/src/gl-proto.js
speaks 13 and rejects them; any page GL client failed its handshake.

Rebuilt from master's sources with guest/gl/build.sh. It needs the
third_party/opengl-registry submodule:
- musl AArch64: the usual aarch64-linux-musl-gcc;
- glibc AArch64: zig 0.17 cc -target aarch64-linux-gnu.2.34. No
  aarch64-linux-gnu-gcc is installed here; 3ca92191 used Debian gcc 12.
- x86-64: zig cc -target x86_64-linux-musl, as before.

The musl build is byte-identical to the one merge/singleproc uses. There,
gles-gears in the page draws 640 triangles over 30 frames with gl error 0,
covering 15% of the canvas. The glibc and x86-64 builds come from the same
source but have not been run.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_781bad2ec05143db9067c86b4b2678e2

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