Use a static filename for the header of RELEASE_SQL

One place less to update when bumping the version number.

Author: df7cb

Diff for: Makefile

@@ -19,7 +19,7 @@ OBJS      += src/healpix.o src/moc.o src/process_moc.o \
              healpix_bare/healpix_bare.o
 endif
 
-DATA_built  = $(RELEASE_SQL) \
+DATA_built  = \
 			  pg_sphere--1.2.0--1.2.1.sql \
 			  pg_sphere--1.2.1--1.2.2.sql \
 			  pg_sphere--1.2.2--1.2.3.sql \
@@ -109,8 +109,7 @@ endif
 pg_sphere.test.sql: $(RELEASE_SQL) $(shlib)
 	tail -n+3 $< | sed 's,MODULE_PATHNAME,$(realpath $(shlib)),g' >$@
 
-
-$(RELEASE_SQL): $(addsuffix .in, $(RELEASE_SQL) $(PGS_SQL))
+$(RELEASE_SQL): pg_sphere_head.sql.in $(addsuffix .in, $(PGS_SQL))
 	cat $^ > $@
 
 ifneq ($(USE_HEALPIX),0)