Using jniThrowErrnoException in android_util_Process

Since libnativehelper now has an implementation of jniThrowErrnoException,
this method is now used when a system error occurs to avoid code
duplication.

Bug: 180958753
Test: m
Change-Id: I14b8f6c5fb7179624450ecaae10c6bb1f48b4029
1 file changed