review request (XXS): 6983296: build sanity checks for jdk7

[John Coomes]

Trivial change to solaris makefiles to complain if anything other than
SS12u1 is used.  Prior to this change, SS12 was also accepted without
complaint.

http://cr.openjdk.java.net/~jcoomes/6983296-ss12u1-sanity/

-John