[TDEMacros.cmake] added tde_save_and_set() macro

modules/TDEMacros.cmake

@@ -1,6 +1,6 @@
 #################################################
 #
-#  (C) 2010-2011 Serghei Amelian
+#  (C) 2010-2012 Serghei Amelian
 #  serghei (DOT) amelian (AT) gmail.com
 #
 #  (C) 2011-2012 Timothy Pearson
@@ -1283,6 +1283,11 @@ macro( tde_save )
   endforeach()
 endmacro()
 
+macro( tde_save_and_set _var )
+  set( __bak_${_var} ${${_var}} )
+  set( ${_var} ${ARGN} )
+endmacro( )
+
 macro( tde_restore )
   foreach( _var ${ARGN} )
     set( ${_var} ${__bak_${_var}} )