LIBZMQ-541 fix
Fix a few invalid forward declarations

A few forward declarations use mismatched struct and class types. Clang
won't compile this with -Werror.
Merge pull request #93 from cjuniet/master

[LIBZMQ-543] Fix compilation errors with Clang
simple Makefile for mingw32
Merge pull request #96 from pijyoi/master

simple Makefile for mingw32
Add MSVC 2013 preview support; Fix upstream CMake changes wrt. PDB and lib locations.
Merge remote-tracking branch 'upstream/master'
Merge pull request #97 from steve-o/master

Add MSVC 2013 support; Fix CMake regressions upstream
Use MSVC2012's msbuild to drive everything using toolkit support for actually compilations.
Merge pull request #98 from steve-o/master

Migrate to using MSVC toolkit support independent of compiler versioning.
Merge pull request #99 from leewoosung/hotfixes/patched

Backport for LIBZMQ-541 fix
Fixed missing whitespace at end of file
Merge pull request #102 from hintjens/master

Build failed on some boxes due to missing EOL at EOF