(libT) add rb07's win32 implementation of tr_mkstemp()

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@13968 f4695dd4-2c0a-0410-b89c-da849a56a58e
(trunk) add portability wrappers tr_rename(), tr_remove() for the rename() and remove() funcs s.t. utf16 can be handled


git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@13969 f4695dd4-2c0a-0410-b89c-da849a56a58e
(trunk) prefer tr_remove() to unlink() or rmdir()

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@13970 f4695dd4-2c0a-0410-b89c-da849a56a58e