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

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-export:JNI_GetDefaultJavaVMInitArgs

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-export:JNI_CreateJavaVM

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-export:JNI_GetCreatedJavaVMs

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-export:jio_snprintf

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-export:jio_printf

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-export:jio_fprintf

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-export:jio_vfprintf

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-export:jio_vsnprintf

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