sceHttp2CreateCookieBox hands out an id from the library's handle
counter, sceHttp2SetCookieBox binds one to a template or request, and
sceHttp2CookieFlush succeeds: no request reaches the network, so no
cookie is ever stored. sceHttp2SetRequestNoContentLength is accepted
like sceHttp2SetRequestContentLength. The library gets its own
CMakeLists for the new guest_http2 test.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Chad