Use DATA variable instead DATA_built for contrib/snowball_ext

Author: dmpgpro

contrib/snowball_ext/Makefile

@@ -11,7 +11,7 @@ OBJS= snowball_ext.o libstemmer/api.o libstemmer/utilities.o \
 	libstemmer/stem_UTF_8_nepali.o $(WIN32RES)
 
 SQLSCRIPT= snowball_ext--1.0.sql
-DATA_built = $(SQLSCRIPT)
+DATA = $(SQLSCRIPT)
 
 ifdef USE_PGXS
 PG_CONFIG = pg_config