progs/perf: add scons support, get working under mingw
diff --git a/progs/SConscript b/progs/SConscript
index 620dd30..66eaf9e 100644
--- a/progs/SConscript
+++ b/progs/SConscript
@@ -10,4 +10,5 @@
     'vpglsl/SConscript',
     'fp/SConscript',
     'wgl/SConscript',
+    'perf/SConscript',
 ])