Reverts http://cgit.freedesktop.org/mesa/mesa/commit/?h=7.10&id=b0a7492aebeb4517346f0da2362d6991a7385b59
because it breaks kwin, see http://blog.martin-graesslin.com/blog/2011/04/why-blur-does-not-work-in-kubuntu-natty-with-intel/


--- src/mesa/drivers/dri/intel/intel_context.c	2011-03-01 22:35:03.000000000 +0100
+++ src/mesa/drivers/dri/intel/intel_context.c	2011-04-20 11:03:25.982000309 +0200
@@ -61,6 +61,8 @@
 int INTEL_DEBUG = (0);
 #endif
 
+#define DRIVER_DATE "20100330 DEVELOPMENT"
+#define DRIVER_DATE_GEM "GEM " DRIVER_DATE
 
 static const GLubyte *
 intelGetString(struct gl_context * ctx, GLenum name)
@@ -178,7 +180,7 @@
          break;
       }
 
-      (void) driGetRendererString(buffer, chipset, "", 0);
+      (void) driGetRendererString(buffer, chipset, DRIVER_DATE_GEM, 0);
       return (GLubyte *) buffer;
 
    default: