Added some code to fix Tcl and its use of OpenGL backends

It is necessary to translate numbers to Roman numerals for the Tcl
language, then the Tcl tests work with the OpenGL2 backend.

Change-Id: I681281f7611217d85581a30b083742eec11a1f33
Added excludes for OpenGL2 headers

Change-Id: I04e6970d1ec703e5b54e597c782f6c602725f3dd
Merge topic 'header-tests-opengl2' into master

f1d3e72e Added excludes for OpenGL2 headers
Merge topic 'tcl-roman-numerals-opengl2' into master

2cfa25be Added some code to fix Tcl and its use of OpenGL backends