RFR: 8160825 Update minimum Solaris Studio compiler version to 5.13

[Tim Bell]

Hello Stefan:

> 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/

Looks good.  Sun Studio 12.4 contains the C++ 5.13 compiler:

% devkit/SS12u4-Solaris11u1/SS12u4/bin/CC -V
CC: Sun C++ 5.13 SunOS_i386 151846-10 2015/10/30

Since this change is in an open .m4 file, remember to run 
common/autoconf/autogen.sh and then push both open and closed 
generated-configure.sh files.

Tim