[MT patch]: lowercase architecture names

[Nick Clifton]

Hi Nathan,

> This patch changes the mt assembler to only accept lowercase 
> architecture names, in line with existing practice.  GCC's multilib 
> support forced lower case names and now gcc itself is case sensitive.  
> The patch also changes the default to ms1-16-002, which is the same as 
> gcc's default.

Is this really of any benefit ?  Is there some intention to have 
uppercase variants of the name mean something different ?

Cheers
   Nick