[libsupc++_related] Suppress warning in unwind-pe.h

[Paolo Carlini]

Hi,

we are getting this warning:

In file included from 
../../../../gcc-head/gcc/libstdc++-v3/libsupc++/eh_personality.cc:38:
/home/paolo/Gcc/cvs-dirs/gcc-head/gcc/libstdc++-v3/../gcc/unwind-pe.h: 
In function `const unsigned
char* read_encoded_value_with_base(unsigned char, _Unwind_Ptr, const 
unsigned char*, _Unwind_Ptr*)'
:
/home/paolo/Gcc/cvs-dirs/gcc-head/gcc/libstdc++-v3/../gcc/unwind-pe.h:194: 
warning: cast from `cons
t unsigned char*' to `read_encoded_value_with_base(unsigned char, 
_Unwind_Ptr, const unsigned char*
, _Unwind_Ptr*)::unaligned*' discards qualifiers from pointer target type

which I fixed with the below, regtested on i686-pc-linux-gnu, C, C++.

Ok?

Paolo.

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