Use only std::string in TWFunc::Get_Folder_Size

* Fixes crash which could occur with too deep path because
  of too much memory allocated on stack
fix wrong debuging output of used BUILD FLAGS in data.cpp
Fix misspelling and white space on fix perms

Thanks to Space- for pointing it out
Merge "fix wrong debuging output of used BUILD FLAGS in data.cpp" into twrp2.4
Merge "Fix misspelling and white space on fix perms" into twrp2.4
Merge pull request #1 from TeamWin/twrp2.4

Twrp2.4