__attribute__ macro is not defined in msvc and it is not essential to
the implementation. All it does is tell the compiler that this function
is similar to printf, and expects a printf-like format string
So for MSVC we define __attribute__ as a macro that do nothing
there are views or functions depending on columns after dropped ones.
The issue was reported by depesz, and original patch by Denish Patel.
Improved documentation how to build binaries from source.
COPYRIGHT updated.
