Save and restore CMake policies so that it does not cause CMP0011

in the case of use as a slave - tde_automoc, tde_uic.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit d1c467a7da)

modules/TDEMacros.cmake

@@ -67,6 +67,7 @@ endif()
 #####
 ##### set necessary CMake policies
 
+cmake_policy( PUSH )
 if( POLICY CMP0057 )
   # necessary for CheckLinkerFlag
   cmake_policy( SET CMP0057 NEW )
@@ -224,9 +225,15 @@ macro( tde_read_src_metadata )
 endmacro( tde_read_src_metadata )
 
 
+################################################
+#####
+##### finalization as a slave part
+
 if( DEFINED MASTER_SOURCE_DIR )
+  cmake_policy( POP )
   return( )
 endif( )
+
 ########### slave part ends here ###############
 
 
@@ -3217,3 +3224,13 @@ macro( tde_setup_polkit )
   endif( )
 
 endmacro( )
+
+
+#################################################
+#####
+##### restore CMake policies
+
+cmake_policy( POP )
+
+
+#################################################