[PATCH] Fix uninstall-local target in Makefile.rules for shared libraries

[Tim Northover]

Hi Edward-san,

> Hi. before this patch, the files which didn't have the 'lib' prefix, like
> 'LLVMgold.so' , couldn't be removed when "make uninstall-local" was invoked.
> This is conformant to the other 'uninstall-local' targets regarding the
> Archives, Tools and ToolAliases.

I've committed this as r187793. Sorry about the delay.

Tim.