vulkan-headers: build using ninja to fix `gcc-14` compatibility

When `vulkan-headers` detects `gcc-14` or above it enables c++ modules
support. But make-mased backend does not support it and fails as:

    $ nix build --impure --expr 'with import ./. {}; vulkan-headers.override {stdenv = gcc14Stdenv; }' -L

    CMake Error in CMakeLists.txt:
      The target named "Vulkan-Module" has C++ sources that may use modules, but
      modules are not supported by this generator:
        Unix Makefiles
      Modules are supported only by Ninja, Ninja Multi-Config, and Visual Studio
      generators for VS 17.4 and newer.  See the cmake-cxxmodules(7) manual for
      details.  Use the CMAKE_CXX_SCAN_FOR_MODULES variable to enable or disable
      scanning.

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