spirv_to_dxil: Fix missing-prototypes build error.
../src/microsoft/spirv_to_dxil/spirv_to_dxil.c: At top level: ../src/microsoft/spirv_to_dxil/spirv_to_dxil.c:200:1: error: no previous prototype for ‘spirv_to_dxil_get_version’ [-Werror=missing-prototypes] 200 | spirv_to_dxil_get_version() | ^~~~~~~~~~~~~~~~~~~~~~~~~
Fixes: 92b0cf8e ("spirv_to_dxil: expose version number") Signed-off-by: Vinson Lee vlee@freedesktop.org