[cfe-dev] Patch to quiet some options

[David Chisnall]

Hi,

This patch stops the driver complaining that -pthread is only used  
when linking (some platforms use it when compiling to set some  
#defines, so a lot of Makefiles pass it at all stages of compilation).

It also adds -Wno-import, which is silently ignored.  Clang defaults  
to the behaviour that GCC exhibits when -Wno-import is specified (not  
warning that #import is deprecated).

David
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