Fix for compilation with ICL on Visual Studio

[BrunoReX]

You won't be able to compile ImageMagick on Windows using Visual Studio and the Intel C++ Compiler, it complains about the preprocessor definitions for libtiff since they are all in the same line, the solution is to give each of them its own line. Here's a patch for VisualMagick.

I was able to compile it using ICL13/VS2012 just by doing that change.

[magick]

Thanks for the patch. We'll get it into the next point release of ImageMagick.