luxmark: drop hostmakedepends provided by build_style

srcpkgs/luxmark/template

@@ -3,7 +3,6 @@ pkgname=luxmark
 version=3.1
 revision=4
 build_style=cmake
-hostmakedepends="cmake"
 makedepends="openimageio-devel tiff-devel libpng-devel libgomp-devel
  libopenexr-devel MesaLib-devel ocl-icd-devel opencl-headers boost-devel
  python-devel luxrays-devel glew-devel libfreeglut-devel qt-devel opencl-clhpp"