Remove ext_interp experiment flag

Change-Id: I8dcf7b4284da391c63ae5afc4b7637394b862cd8

build/cmake/aom_config.h.cmake

@@ -105,7 +105,6 @@
 #define CONFIG_EXT_INTRA ${CONFIG_EXT_INTRA}
 #define CONFIG_FILTER_INTRA ${CONFIG_FILTER_INTRA}
 #define CONFIG_EXT_INTER ${CONFIG_EXT_INTER}
-#define CONFIG_EXT_INTERP ${CONFIG_EXT_INTERP}
 #define CONFIG_EXT_REFS ${CONFIG_EXT_REFS}
 #define CONFIG_GLOBAL_MOTION ${CONFIG_GLOBAL_MOTION}
 #define CONFIG_NEW_QUANT ${CONFIG_NEW_QUANT}

build/cmake/aom_config_defaults.cmake

@@ -105,7 +105,6 @@ set(CONFIG_SUB8X8_MC 0 CACHE BOOL "Internal flag.")
 set(CONFIG_EXT_INTRA 0 CACHE BOOL "Internal flag.")
 set(CONFIG_FILTER_INTRA 0 CACHE BOOL "Internal flag.")
 set(CONFIG_EXT_INTER 0 CACHE BOOL "Internal flag.")
-set(CONFIG_EXT_INTERP 0 CACHE BOOL "Internal flag.")
 set(CONFIG_EXT_REFS 0 CACHE BOOL "Internal flag.")
 set(CONFIG_GLOBAL_MOTION 0 CACHE BOOL "Internal flag.")
 set(CONFIG_NEW_QUANT 0 CACHE BOOL "Internal flag.")

configure

@@ -262,7 +262,6 @@ EXPERIMENT_LIST="
     filter_intra
     ext_inter
     compound_segment
-    ext_interp
     ext_refs
     global_motion
     new_quant