Wrote a macro to make ccall look a little more like Julia. Need an opinion on the return type placement

General Usage
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This works some of the time, but is not portable or reliable. For example, this works for me on MacOS:

julia> ccall(:printf, Cint, (Cstring,), "Hello world!\n")
Hello world!
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julia> ccall(:printf, Cint, (Cstring, Cdouble), "A number %g.\n", 3.14159)
A number 3.14159.
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but on Windows I get:

julia> ccall(:printf, Cint, (Cstring,), "Hello world!\n")
Hello world!
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julia> ccall(:printf, Cint, (Cstring, Cdouble), "A number %g.\n", 3.14159)
A number 0.
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