Add a simple test list for regression testing. A much broader test base is needed, however.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@19954 e7fa87d3-cd2b-0410-9028-fcbf551c1848

Test/testlist

@@ -0,0 +1,8 @@
+sample.frag
+sample.vert
+specExamples.frag
+specExamples.vert
+versionsClean.frag
+versionsClean.vert
+versionsErrors.frag
+versionsErrors.vert