Simplify code since cmake minimum version is now 3.5

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>

modules/TDEMacros.cmake

@@ -21,8 +21,8 @@
 ##### initialization...
 
 if( NOT TDE_CMAKE_ROOT )
-  if( "${CMAKE_VERSION}" VERSION_LESS "3.1" )
-    message( FATAL_ERROR "CMake >= 3.1.0 required" )
+  if( "${CMAKE_VERSION}" VERSION_LESS "3.5" )
+    message( FATAL_ERROR "CMake >= 3.5.0 required" )
   endif()
 
   if( ${CMAKE_CURRENT_LIST_DIR} STREQUAL ${CMAKE_ROOT}/Modules )
@@ -1131,11 +1131,7 @@ macro( tde_add_library _arg_target )
 
   # set -fPIC flag for static libraries
   if( _static_pic )
-    if( "${CMAKE_VERSION}" VERSION_LESS "2.8.9" )
-      set_target_properties( ${_target} PROPERTIES COMPILE_FLAGS -fPIC )
-    else( )
     set_target_properties( ${_target} PROPERTIES POSITION_INDEPENDENT_CODE ON )
-    endif( )
   endif( _static_pic )
 
   # set version
@@ -1176,23 +1172,16 @@ macro( tde_add_library _arg_target )
 
   # set private linked libraries
   if( _link_private )
-    if( NOT ${CMAKE_VERSION} VERSION_LESS "2.8.12" )
     if( _link )
       list( INSERT _link 0 "PUBLIC" )
     endif()
     list( INSERT _link_private 0 "PRIVATE" )
-    endif()
     list( INSERT _link 0 ${_link_private} )
   endif( _link_private )
 
   # set link libraries
   if( _link )
-    if( _embed AND ${CMAKE_VERSION} VERSION_EQUAL "2.8.12.0" )
-      # hack for broken CMake 2.8.12.0
-      set_target_properties( ${_target} PROPERTIES LINK_LIBRARIES "${_link}" )
-    else( _embed AND  ${CMAKE_VERSION} VERSION_EQUAL "2.8.12.0" )
     target_link_libraries( ${_target} ${_link} )
-    endif( _embed AND  ${CMAKE_VERSION} VERSION_EQUAL "2.8.12.0" )
   endif( )
   if( _shared_libs )
     string( TOUPPER "${CMAKE_BUILD_TYPE}" _build_type )