[patch] prevent build warnings from arlex.l and syslex.l

[John Marino]

Last week I patch I submitted that prevented ld/ldlex.l from emitting a 
warning during the build process was committed:

http://sourceware.org/cgi-bin/cvsweb.cgi/src/ld/ldlex.l.diff?cvsroot=src&r1=1.50&r2=1.51

It turns out that binutils/arlex.l and binutils/syslex.l have exactly 
the same problem.  The attached patch will silence these warnings on 
those files too.

Regards,
John

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