Fix conda build on 32-bit Windows

Author: dean0x7d

conda.recipe/bld.bat

@@ -1,4 +1,5 @@
-call "%VS140COMNTOOLS%\..\..\VC\vcvarsall.bat" x64
+if "%ARCH%" == "32" (set PLATFORM=x86) else (set PLATFORM=x64)
+call "%VS140COMNTOOLS%\..\..\VC\vcvarsall.bat" %PLATFORM%
 set DISTUTILS_USE_SDK=1
 set MSSdk=1
 "%PYTHON%" setup.py install