6938185: 3/4 6923488 breaks Windows command shell builds Summary: Fix build.bat so invoking command shell doesn't exit on error. Fix dirname assumptions. Document some MKS environment dependencies. Reviewed-by: coleenp

// Platform file for windows platform

os_family = windows

arch = x86

arch_model = x86_32

os_arch = windows_x86

os_arch_model = windows_x86_32

lib_arch = i386

compiler = visCPP