mesa: Support glGetString(GL_SHADING_LANGUAGE_VERSION) for >= 1.40.

This will need to get refactored when we add support for core profiles
or forward-compatible contexts, but we may as well have it in the
meantime.  This allows us to override the GLSL version and experiment.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>

src/mesa/main/getstring.c

@@ -56,6 +56,16 @@ shading_language_version(struct gl_context *ctx)
          return (const GLubyte *) "1.30";
       case 140:
          return (const GLubyte *) "1.40";
+      case 150:
+         return (const GLubyte *) "1.50";
+      case 330:
+         return (const GLubyte *) "3.30";
+      case 400:
+         return (const GLubyte *) "4.00";
+      case 410:
+         return (const GLubyte *) "4.10";
+      case 420:
+         return (const GLubyte *) "4.20";
       default:
          _mesa_problem(ctx,
                        "Invalid GLSL version in shading_language_version()");