Revision 35

Fixup the constructor/destructor function names again (they should be _init()
and _fini() it seems, and not being called caused sandbox_lib_path to be
unset, and thus breaking the execve() wrapper's LD_PRELOAD protection).
Add both the path in given SANDBOX_x variable, as well as its symlink
resolved path in init_env_entries().  Modify filter_path() to be able to
resolve paths without resolving symlinks, as well as to be able to resolve
symlinks.  Fix a possible segfault in check_access().  Add symlink resolving
to check_access() resolving bug #31019.  Add 'hack' for unlink, as the fix
for bug #31019 cause access violations if we try to remove a symlink that is
not in protected path, but points to a protected path.  Fix a memory leak in
sandbox.c (sandbox_pids_file in main()).  Fix the realpath() calls in main()
(sandbox.c) being unchecked.  Fix the debug logname not having the pid in it
(pid_string was uninitialized).  General syntax cleanups.