Silence class vs. struct warnings (vec)

[Oleg Endo]

Hi,

When building GCC on OSX with its native XCode/Clang tools, it outputs
quite some "struct X was previously declared as a class" or similar
warnings (-Wmismatched-tags is enabled by default).

The attached patch fixes a mismatch in struct vec_prefix when referring
to struct vec.

Tested with make all-gcc.
OK for trunk?

Cheers,
Oleg

gcc/ChangeLog:
        * vec.h (struct vec_prefix): Use struct vec instead of class 
	vec.
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