Fixed build on Windows

Building cmake\projects\vs2013\host-glut\moai.vcxproj
used to fail with the following errors:

LIBCMT.lib(invarg.obj) : error LNK2005: __invalid_parameter already
defined in MSVCRTD.lib(MSVCR120D.dll)

LIBCMT.lib(invarg.obj) : error LNK2005: __invoke_watson already defined
in MSVCRTD.lib(MSVCR120D.dll)

MSVCRTD.lib(MSVCR120D.dll) : error LNK2005: __strdup already defined in
LIBCMT.lib(strdup.obj)

...\cmake\projects\vs2013\host-glut\Debug\moai.exe :
fatal error LNK1169: one or more multiply defined symbols found
Merge pull request #909 from DanielSWolf/fix_build

Fixed build on Windows. Force link to msvcrt dll instead of static