Mark GL_EXT_separate_depth_stencil as "Complete"

extensions/EXT/EXT_separate_depth_stencil.txt

diff --git a/extensions/EXT/EXT_separate_depth_stencil.txt b/extensions/EXT/EXT_separate_depth_stencil.txt
index 1106793..2844230 100644
--- a/extensions/EXT/EXT_separate_depth_stencil.txt
+++ b/extensions/EXT/EXT_separate_depth_stencil.txt
@@ -16,7 +16,7 @@
 
 Status
 
-    TBD
+    Complete
 
 Version