v6.06.06-3

Configuration completed:

• streamlined custom compilation flags in settings.cmake
• correctly enable pthread and multithreading for GCC and builtin LLVM
• Roll back to old ABI as there are currently issues upstream; makes the package also compatible with XROOTD and Pythia
• correctly configure installation folders (bin,lib,include,share,etc)
• use shared libs instead of built-in ones when possible; currently builtin_llvm=OFF is not possible (as per ROOT devs)
• use Arch's intel_tbb instead of building it
• the package will now fail to build on missing deps
• TMVA and Multi-Threading are now correctly enabled
• 'gcc-fortran' is now correctly an optional dependency
• added missing 'tcsh' as optional dependency
• let Pacman deal with installation hooks
• corrected link flags and symbol stripping
• trim unneeded dependencies
• other small fixes here and there