fix ios build issues

The framework was using the vtk version but it was not set
yet in the CMakeLists file.

Old 32 bit architecture was on by default. Rmeoved.

(cherry picked from commit bc4923bd)

CMake/vtkiOS.cmake

@@ -13,7 +13,7 @@ file(REMOVE_RECURSE ${INSTALL_DIR})
 # Define default architectures to compile for
 set(IOS_SIMULATOR_ARCHITECTURES "x86_64"
     CACHE STRING "iOS Simulator Architectures")
-set(IOS_DEVICE_ARCHITECTURES "arm64;armv7"
+set(IOS_DEVICE_ARCHITECTURES "arm64"
     CACHE STRING "iOS Device Architectures")
 list(REMOVE_DUPLICATES IOS_SIMULATOR_ARCHITECTURES)
 list(REMOVE_DUPLICATES IOS_DEVICE_ARCHITECTURES)