* cmake: accept glslang's current tool name and document Python 3
Official glslang release archives for Windows ship the compiler only as
glslang.exe, so configuring with one of them on PATH could not find
glslangValidator. Fall back to glslang; glslangValidator is still
preferred where both exist.
The bundled SPIRV-Tools needs Python 3 at configure time, which the
Windows build requirements did not mention.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* docs: list Python 3 in the Linux and macOS prerequisites
The bundled SPIRV-Tools calls find_host_package(Python3 REQUIRED) on every platform, so the apt and Homebrew package lists need it too, not only the Windows requirements.
* cmake: remove glslang naming comment
---------
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: nmzik <Nmzik@mail.ru>
