VS 2015 fixes

• silo doesn't build with VS2015

\..\src\silo\silo_win32_compatibility.h(15): note: see previous definition of 'snprintf'
C:\...\ucrt\stdio.h(1927): fatal error C1189: #error:  Macro definition of snprintf conflicts with Standard Library function declaration 

• tbb install fails (common-superbuild!239 (merged))

CMake Error at C:/.../superbuild/projects/scripts/tbb.install.cmake:20 (file):
  file INSTALL cannot find
  "C:/...build/superbuild/tbb/src/bin/intel64/vc14/tbb.dll".

CMake Error at C:/.../build/superbuild/sb-tbb-install.cmake:43 (message):
  Failed with exit code 1

• pythontwisted fails (needs Microsoft Visual C++ Compiler for Python 2.)

building 'twisted.test.raiser' extension
error: Microsoft Visual C++ 9.0 is required (Unable to find vcvarsall.bat). Get it from http://aka.ms/vcpython27
CMake Error at C:/bbd/a34746c9/build/superbuild/sb-pythontwisted-build.cmake:47 (message):
  Failed with exit code 1