spirv: check support for SPV_KHR_float_controls capabilities

v2:
- Correct extension name (Caio).
- Rename supported capabilities member (Andres).

Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Reviewed-by: Connor Abbott <cwabbott0@gmail.com> [v1]
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>

src/compiler/shader_info.h

@@ -59,6 +59,7 @@ struct spirv_supported_capabilities {
    bool physical_storage_buffer_address;
    bool post_depth_coverage;
    bool runtime_descriptor_array;
+   bool float_controls;
    bool shader_viewport_index_layer;
    bool stencil_export;
    bool storage_8bit;