RFR(XS): 8158763 : --disable-hotspot-gtest not working on Solaris

[Volker Simonis]

Hi,

I'd like to get the following tiny bug fix into jdk9-dev. What's the
current procedure to get this change approved?

http://cr.openjdk.java.net/~simonis/webrevs/2016/8158763/
https://bugs.openjdk.java.net/browse/JDK-8158763

On Solaris, the configure test for libstlport.so.1 isn't disabled by
--disable-hotspot-gtest. So, if libstlport.so.1 isn't present, the
build will break during configuration even if we set
--disable-hotspot-gtest.

The fix is trivial - just guard the test for libstlport.so.1 by
"x$BUILD_GTEST" = "xtrue".

The fix also adds an alternative location for libstlport.so.1 (from
SS12u3) to keep the sources compilable with SS12u3.

Thank you and best regards,
Volker