Squashed 'libs/libzmq/' content from commit 2b2fb9c7

git-subtree-dir: libs/libzmq
git-subtree-split: 2b2fb9c7082dbc16c1323b97040a4edcfa2b997b

builds/deprecated-msvc/readme.txt

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+For building on Windows, use:
+
+     cd build
+     ./build.bat
+
+This requires that the CMD.EXE be created using the DevStudio Tools link to create a CMD.EXE window. Also, make sure that the name of the project folder is libzmq (not e.g. libzmq-master) as this is required for correct linking.
+
+Visual Studio product and C++ compiler Versions:
+
+Visual C++ 2008 => Visual C++ 9
+Visual C++ 2010 => Visual C++ 10
+Visual C++ 2012 => Visual C++ 11
+Visual C++ 2013 => Visual C++ 12
+Visual C++ 2015 => Visual C++ 14
+Visual C++ 2017 => Visual C++ 15
+
+Note that solution file icons reflect the compiler version ([9], [10], [11], [12], [14], [15]), not the product version.
+
+The vs2017/vs2015/vs2013/vs2012/vs2010 solution and project files differ only in versioning.
+
+More info here:
+
+http://en.wikipedia.org/wiki/Visual_C%2B%2B
+
+If multiple DevStudio versions are installed, you can run build.bat in separate windows each created by the desired DevStudio target.
+
+To build for all versions of Visual Studio (excluding vs2008), you can run buildall.bat. This is generally a maintainer task.