Processed: raise severity as it's totally unusable on powerpc

[Debian Bug Tracking System]

Processing commands for control at bugs.debian.org:

> severity 763900 grave
Bug #763900 [iceweasel] iceweasel/ppc: <jemalloc>Compile-time page size does not divide the runtime one.
Severity set to 'grave' from 'normal'
> thanks
Stopping processing here.

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-- 
763900: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=763900
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