typo fix for obj-coff.c

[Nick Clifton]

Hi Mark,

: gas/config/obj-coff.c contains a typo that allows a symbol to be both weak and common. 
: This should probably also be put into the 2.10 branch for 2.10.1.
: 
: gas/ChangeLog:
: 
: 2000-06-17 Mark Elbrecht <snowball3@bigfoot.com>
: 
: 	* config/obj-coff.c (obj_coff_weak): Typo fix: Change BFD_ASSEMLER to BFD_ASSEMBLER.

I have applied you patch to the mainline sources.

Cheers
	Nick