RFR - 8133249: Occasional SIGSEGV: non thread-safe use of strerr in getLastErrorString

[Rob McKenna]

Hi folks,

Requesting a review of this change which switches corelibs usages of the 
thread-unsafe strerror over to strerror_r/strerror_s:

http://cr.openjdk.java.net/~robm/8133249/webrev.01/

        -Rob