RFR: 8160825 Update minimum Solaris Studio compiler version to 5.13

[Stefan Anzinger]

This is a small change, to update the ckeck in configure to warn if the 
required Solaris Studio Compiler 5.13 is not available (As stated in the 
README-builds.html).

http://cr.openjdk.java.net/~sanzinger/8160825/webrev.00/
Stefan