It ignores the previous JANSSONINSTALL*_DIR variables. But they were
broken, only affecting the pkg-config creation logic, not the actual
installation directory. This can't break anybody's existing usage.
Coverage remained the same at 96.232% when pulling a52d65fc67c5050d516c7c37d36e8c25a8114a3f on RedDwarf69:cmake_fixes into 2de2c3d5fc702396a2a5ae8f70ab98a0011d486e on akheron:master.
It ignores the previous JANSSONINSTALL*_DIR variables. But they were broken, only affecting the pkg-config creation logic, not the actual installation directory. This can't break anybody's existing usage.