progs/trivial: Add tri-fbo-tex-mip

   Tests rendering to mip levels other then first
diff --git a/progs/trivial/SConscript b/progs/trivial/SConscript
index 4796a4d..9444cdb 100644
--- a/progs/trivial/SConscript
+++ b/progs/trivial/SConscript
@@ -88,6 +88,7 @@
 	'tri-cull',
 	'tri-dlist',
 	'tri-edgeflag',
+	'tri-fbo-tex-mip',
 	'tri-fbo-tex',
 	'tri-fbo',
 	'tri-flat-clip',