[BusyBox] umount size reduction

[Tito]

Hi, Rob
I've reduced the size of umount by using getoptulflags.
So far I've no diff as it needs more testing and i don't know
enough about the corner cases and probably I've messed up
a bit your logic.
Maybe you can give it a look and a try?!
I'll send the whole file as drop in replacement.
Size reduction so far is:
root at localhost:/dev/pts/2:/root/Desktop/busybox1# size util-linux/umount.o.orig
   text    data     bss     dec     hex filename
    947       0       0     947     3b3 util-linux/umount.o.orig
root at localhost:/dev/pts/2:/root/Desktop/busybox1# size util-linux/umount.o
   text    data     bss     dec     hex filename
    801       0       0     801     321 util-linux/umount.o

Ciao,
Tito
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