bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash

#define MY_VER_MAJOR 4
#define MY_VER_MINOR 57
#define MY_VER_BUILD 0
#define MY_VERSION "4.57"
#define MY_7ZIP_VERSION "7-Zip 4.57"
#define MY_DATE "2007-12-06"
#define MY_COPYRIGHT "Copyright (c) 1999-2007 Igor Pavlov"
#define MY_VERSION_COPYRIGHT_DATE MY_VERSION "  " MY_COPYRIGHT "  " MY_DATE