RFR: 8005545: Add System property to identify ARCH specific details such as ARM hard-float binaries

[Vladimir Danushevsky]

Please review changes for https://jbs.oracle.com/bugs/browse/JDK-8005545  "Add System property to identify ARCH specific details such as ARM hard-float binaries" which adds an optional sun.os.abi Java system property indicating an ABI type being used by the JVM:

CCC Reguest: http://ccc.us.oracle.com/8005545

Webrev:
http://cr.openjdk.java.net/~vladidan/8005545/webrev.00/

Separate change to the build script (e.g. in ARM Hard-Float ABI case):
setenv ARCHABIPROPNAME gnueabihf
-DARCHABIPROPNAME="\"$(ARCHABIPROPNAME)\""  is passed to the CFLAGS

Thanks,
Vlad