Adding experimental tags for new experiments

ext-partition: to hold partition extensions (ex. ext-partition,
ext-coding-unit-size from nextgen)
loop-restore: to hold in-loop restoration filter (ex. loop-postfilter
from nextgen and other Wiener restoration filters)

Change-Id: I71c7f1588f05fb0f2b00f7004a78e90c9cceae3f
diff --git a/configure b/configure
index c0e8980..458feec 100755
--- a/configure
+++ b/configure
@@ -280,6 +280,8 @@
     ext_refs
     supertx
     ans
+    loop_restoration
+    ext_partition
 "
 CONFIG_LIST="
     dependency_tracking