tests/Makefile: allow FILTER* to be called with lists of filter names

tests/Makefile

@@ -47,9 +47,9 @@ ENCMUX  = $(call ALLYES, $(1:%=%_ENCODER) $(2)_MUXER)
 
 DEMMUX  = $(call ALLYES, $(1)_DEMUXER $(2)_MUXER)
 
-FILTERDEMDEC       = $(call ALLYES, $(1)_FILTER $(2)_DEMUXER $(3)_DECODER)
-FILTERDEMDECMUX    = $(call ALLYES, $(1)_FILTER $(2)_DEMUXER $(3)_DECODER $(4)_MUXER)
-FILTERDEMDECENCMUX = $(call ALLYES, $(1)_FILTER $(2)_DEMUXER $(3)_DECODER $(4)_ENCODER $(5)_MUXER)
+FILTERDEMDEC       = $(call ALLYES, $(1:%=%_FILTER) $(2)_DEMUXER $(3)_DECODER)
+FILTERDEMDECMUX    = $(call ALLYES, $(1:%=%_FILTER) $(2)_DEMUXER $(3)_DECODER $(4)_MUXER)
+FILTERDEMDECENCMUX = $(call ALLYES, $(1:%=%_FILTER) $(2)_DEMUXER $(3)_DECODER $(4)_ENCODER $(5)_MUXER)
 
 PARSERDEMDEC       = $(call ALLYES, $(1)_PARSER $(2)_DEMUXER $(3)_DECODER)