With MDL-42148, once implemented, we need to change the way the codechecker loads thirdpartylibs.xml to be able to continue excluding those libs without problem.

Notes:

To make it BC, without braching codechecker, due to changes in component classes and friends:

1) If admin/thirdpartylibs.php does not exist, we are in < 2.6 version, for sure we must continue using the unique, central, thirdpartylibs.xml

2) Else, copy code from admin/thirdpartylibs.php, that will:

• iterate over all plugin types.
• return all the components having a thirdpartylibs.xml file
• load all the found files
• proceed with the exclusion.

That should work