File bundled_libharu_add_missing_libm.patch of Package vtk

--- VTK-8.2.0/ThirdParty/libharu/vtklibharu/src/CMakeLists.txt_orig	2019-02-14 22:43:46.723537248 +0100
+++ VTK-8.2.0/ThirdParty/libharu/vtklibharu/src/CMakeLists.txt	2019-02-14 22:45:37.203271692 +0100
@@ -101,8 +101,10 @@
   )
 endif(LIBHPDF_SHARED)
 else ()
-  vtk_add_library(vtklibharu ${LIBHPDF_SRCS})
+  vtk_add_library(vtklibharu ${LIBHPDF_SRCS})
+  set_property(TARGET vtklibharu PROPERTY POSITION_INDEPENDENT_CODE ON)
   target_link_libraries(vtklibharu PRIVATE ${vtkzlib_LIBRARIES} ${vtkpng_LIBRARIES})
+  target_link_libraries(vtklibharu PUBLIC m)
   if (WIN32)
     set_target_properties(vtklibharu
       PROPERTIES