complain "unknown file type" if it tries to extract an oldgnu tar file
and TAR_FEATURE_OLDGNU_COMPATABILITY sint defined.
Print a warning if unisupported gnu extensions are encountered.
New complex patch for decrease size devel version. Requires previous patch.
Also removed small problems from dutmp and tar applets.
Also includes vodz' last_patch61_2:
Last patch correcting comment for #endif and more integrated
with libbb (very reduce size if used "cat" applet also).
Requires last_patch61 for modutils/config.in.
In most cases, dirname returns the same argument it was given, so this code
works nice, but there's one special case: when the name contains no
dirname, it returns "." (stored statically in the body of itself), and we
get a segfault in attempt to free() it.
This patch fixes this problem.
