tde_install_export: Sort individual exported files before generating

a summary export file so that the generated output is reproducible.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 857971e810)

modules/TDEMacros.cmake

@@ -752,6 +752,7 @@ endmacro( tde_install_libtool_file )
 
 function( tde_install_export )
   file( GLOB export_files ${CMAKE_CURRENT_BINARY_DIR}/export-*.cmake )
+  list( SORT export_files )
 
   set( mode "WRITE" )
   foreach( filename ${export_files} )