RFR 9: 8129535: java_props_md.c should compile on VS 2010

[Roger Riggs]

Please review a minor correction so java_props_md.c will compile with 
Visual Studio 2010.
(Declarations are allowed in the middle of blocks only in later versions).
Webrev:
    http://cr.openjdk.java.net/~rriggs/webrev-props-vs1010-8129535/

Issue:
  https://bugs.openjdk.java.net/browse/JDK-8129535

Thanks, Roger