CINT Dictionary Fix, master branch (2019.06.06.)
Fixed a mistake that crept in during the last big update (!475 (merged)) of this code.
This was preventing incremental builds from re-generating dictionaries correctly when header files, from which CINT dictionaries are generated, got modified.
This was discovered in athena!23831 (merged), and was a bit discussed in ATLINFR-1644.
I tried to now very explicitly test, using akraszna/CMakeDictionaryTests, that this update would make the builds return to their expected behaviour. (I didn't do such rigorous tests with the previous update...