PROGRAM path CANNOT be absolute path

[mingc00]

When program path is absolute path, an error occured.

$ ./caretaker /tmp/a.out
./caretaker: Error executing(forgot to link statically?).

[fanzeyi]

Confirmed this bug on Ubuntu 12.04.2 x86-64

cc @Hexcles @lx75249

[Hexcles]

Confirmed this bug.

Reason: I assumed the prgfileName is just the "filename" of the program, without path. And the following actions are based on this assumption: create tmpfile, move prgfile, run prgfile(after chroot, thus cannot include original path name). I'll try to fix this later.