update to depmod.pl for symbols with leading _

[Stuart Hughes]

I was contacted regarding a problem with later kernels being built that
don't use the -mno-underscore.  This means that the the 'known symbol'
printk used to force the listing of modules with no dependencies by
depmod.pl wouldn't work.

This patch corrects that by using a known dummy symbol instead of trying
to guess between printk/_printk.

Regards, Stuart
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