Use common CMake tests.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit cdbb1c0a4c)

ConfigureChecks.cmake

@@ -16,16 +16,13 @@ tde_setup_architecture_flags( )
 include(TestBigEndian)
 test_big_endian(WORDS_BIGENDIAN)
 
+tde_setup_largefiles( )
+
 
 ##### check for gcc visibility support
 
 if( WITH_GCC_VISIBILITY )
-  if( NOT UNIX )
-    tde_message_fatal( "gcc visibility support was requested, but your system is not *NIX" )
-  endif( NOT UNIX )
-  set( __KDE_HAVE_GCC_VISIBILITY 1 )
-  set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fvisibility=hidden -fvisibility-inlines-hidden")
-  set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fvisibility=hidden -fvisibility-inlines-hidden")
+  tde_setup_gcc_visibility( )
 endif( WITH_GCC_VISIBILITY )