8u20 review request: RT-35209 - errors in the diagnostics in glContext.createProgram

[Jim Graham]

Chien, Felipe,

I've made some changes to the diagnostic code in glContext.c to help 
track down why WebLauncher is currently failing on Mac.  I need a review 
and perhaps some help making sure that the changes compile on other 
platforms...

Jira: https://javafx-jira.kenai.com/browse/RT-35209
webrev: http://cr.openjdk.java.net/~flar/RT-35209/webrev.00/

			...jim