RFR: JSK-8036609 - Check jdk/src/windows/native/java/lang/ProcessImpl_md.c for JNI pending exceptions

[Mark Sheppard]

Hi
    Please oblige and review the following changes
http://cr.openjdk.java.net/~msheppar/8036609/webrev/

for the issues raised in
https://bugs.openjdk.java.net/browse/JDK-8036609

summary:
changes adds a couple of ExceptionChecks and a jboolean cast for CloseHandle

regards
Mark