musl: add getopt support for non-option arguments
musl libc doesn't support the GNU getopt extension to parse non-option
arguments when the optstring starts with '-'.
This extension is used by some utilities, notably iptables, that
currently return with errors even with perfectly valid invocations.
The patch adds the code needed by getopt.c and getopt_long.c to
implement that extension.
Signed-off-by: Gianluca Anzolin <gianluca@sottospazio.it>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43309
3c298f89-4303-0410-b956-
a3cf2f4a3e73