fix physfs on osx, now all platforms should be happy

Oops

Start port to frontlib

Fix build

Fix SDL library name

find lua.h ...

thou shall not use system headers for crossplatformness

physfs compilation on windows * external calls must always be named * physfs has to be compiled as dll * there shouln't be external variables, implemented a function that sets buffer * physfs extras is now integrated in main physfs * removed physfs extras

use lua headers correctly

Fix typo