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
Add write buffer for tar writes

update fuse to 2.9.2

catch return from unlink so that we don't print error messages when things work
Change-Id: I1115039a0fa5d9d73f78ef1abd79755d7ffd9d96
Change popen in twrpTar to __popen

Change-Id: I921b0647b1f63dd348b059eb630ebe9bf5ec570d