ENH: Remove CMake code block for unsupported versions

Author: blowekamp

CMake/itkExternal_Eigen3.cmake

@@ -21,12 +21,6 @@ if(NOT CMAKE_CONFIGURATION_TYPES)
   )
 endif()
 
-if(CMAKE_SH AND CMAKE_VERSION VERSION_LESS "3.17.0")
-  # Setting CMAKE_SH is required when using "MinGW Makefiles" generator with CMake < 3.17
-  # See https://github.com/InsightSoftwareConsortium/ITK/issues/66#issuecomment-424374973
-  list(APPEND _additional_external_project_args -DCMAKE_SH:PATH=${CMAKE_SH})
-endif()
-
 # Because the header-only nature of Eigen3, EIGEN_MPL2_ONLY definition could be leaked outside ITK.
 # This would wrongly enforce EIGEN_MPL2_ONLY to other libraries using Eigen.
 # We wrap this definition in ITK_USE_EIGEN_MPL2_ONLY, and only enabling it internally in the dashboards and CI,

Modules/ThirdParty/DCMTK/CMakeLists.txt

@@ -285,13 +285,8 @@ endforeach()
       ${ITKDCMTK_LIBDEP} )
   endforeach()
 
-  if(CMAKE_VERSION VERSION_LESS 3.4)
-    set(CMAKE_CXX_COMPILER_LAUNCHER_FLAG )
-    set(CMAKE_C_COMPILER_LAUNCHER_FLAG )
-  else()
-    set(CMAKE_CXX_COMPILER_LAUNCHER_FLAG -DCMAKE_CXX_COMPILER_LAUNCHER:FILEPATH=${CMAKE_CXX_COMPILER_LAUNCHER})
-    set(CMAKE_C_COMPILER_LAUNCHER_FLAG -DCMAKE_C_COMPILER_LAUNCHER:FILEPATH=${CMAKE_C_COMPILER_LAUNCHER})
-  endif()
+  set(CMAKE_CXX_COMPILER_LAUNCHER_FLAG -DCMAKE_CXX_COMPILER_LAUNCHER:FILEPATH=${CMAKE_CXX_COMPILER_LAUNCHER})
+  set(CMAKE_C_COMPILER_LAUNCHER_FLAG -DCMAKE_C_COMPILER_LAUNCHER:FILEPATH=${CMAKE_C_COMPILER_LAUNCHER})
   set(_cross_compiling_flags)
   if(CMAKE_TOOLCHAIN_FILE)
     list(APPEND _cross_compiling_flags -DCMAKE_TOOLCHAIN_FILE:FILEPATH=${CMAKE_TOOLCHAIN_FILE})