vtk: Use the vendored libharu (#11293)

VTK requires a patched libharu that is not maintained upstream
See https://github.com/libharu/libharu/pull/157

var/spack/repos/builtin/packages/vtk/package.py

@@ -34,10 +34,6 @@ class Vtk(CMakePackage):
     variant('ffmpeg', default=False, description='Build with FFMPEG support')
     variant('mpi', default=True, description='Enable MPI support')
 
-    # Haru causes trouble on Fedora and Ubuntu in v8.1.1
-    # See https://bugzilla.redhat.com/show_bug.cgi?id=1460059#c13
-    variant('haru', default=True, description='Enable libharu')
-
     patch('gcc.patch', when='@6.1.0')
 
     # At the moment, we cannot build with both osmesa and qt, but as of
@@ -68,8 +64,6 @@ class Vtk(CMakePackage):
 
     depends_on('mpi', when='+mpi')
 
-    depends_on('libharu', when='+haru')
-
     depends_on('boost', when='+xdmf')
     depends_on('boost+mpi', when='+xdmf +mpi')
 
@@ -109,15 +103,13 @@ def cmake_args(self):
             '-DBUILD_SHARED_LIBS=ON',
             '-DVTK_RENDERING_BACKEND:STRING={0}'.format(opengl_ver),
 
-            '-DVTK_USE_SYSTEM_LIBHARU=%s' % (
-                'ON' if '+haru' in spec else 'OFF'),
-
             # In general, we disable use of VTK "ThirdParty" libs, preferring
             # spack-built versions whenever possible
             '-DVTK_USE_SYSTEM_LIBRARIES:BOOL=ON',
 
             # However, in a few cases we can't do without them yet
             '-DVTK_USE_SYSTEM_GL2PS:BOOL=OFF',
+            '-DVTK_USE_SYSTEM_LIBHARU=OFF',
             '-DVTK_USE_SYSTEM_LIBPROJ4:BOOL=OFF',
             '-DVTK_USE_SYSTEM_OGGTHEORA:BOOL=OFF',