occt: don't build against tbb.

tbb build dependency removed because occt relies
on deprecated behavior.

srcpkgs/occt/template

@@ -2,14 +2,15 @@
 pkgname=occt
 reverts=7.5.0_1
 version=7.4.0p1
-revision=4
+revision=5
 _gittag="V${version//./_}"
 wrksrc=occt-${_gittag}
 build_style=cmake
-configure_args="-DUSE_FREEIMAGE=ON -DUSE_TBB=ON -DUSE_GL2PS=ON -DUSE_VTK=OFF
+# XXX: re-enable -DUSE_TBB=ON if possible when updating
+configure_args="-DUSE_FREEIMAGE=ON -DUSE_GL2PS=ON -DUSE_VTK=OFF
  -DINSTALL_SAMPLES=ON"
-makedepends="freetype-devel glu-devel freeimage-devel gl2ps-devel tbb-devel
- tcl-devel tk-devel"
+makedepends="freetype-devel glu-devel freeimage-devel gl2ps-devel tcl-devel
+ tk-devel"
 short_desc="OpenCASCADE Technology - library for CAD/CAM/CAE applications"
 maintainer="Piraty <piraty1@inbox.ru>"
 license="custom:LGPL-2.1-only-with-exceptions"