[PATCH][Z80] disallow redefining constants with equ

[Arnold Metselaar]

Hello,

The patch below makes gas for target Z80 disallow redefining 
symbols with equ. It also includes a fix for a typo in the 
documentation.

Arnold Metselaar

Changelog

gas/
*config/tc-z80.c(z80_start_line_hook): issue an error when 
redefining a symbol with equ
*doc/as.texinfo(equ<z80>): mention difference with .equiv
*doc/as.texinfo(err): fix typo
*doc/c-z80.texi(equ): redefining a symbol with equ is no longer 
allowed
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