Remove useless CPPFLAGS.

contrib/cube/Makefile

-# $PostgreSQL: pgsql/contrib/cube/Makefile,v 1.18 2006/04/03 18:47:41 petere Exp $
+# $PostgreSQL: pgsql/contrib/cube/Makefile,v 1.19 2007/02/09 17:24:33 petere Exp $
 
 MODULE_big = cube
 OBJS= cube.o cubeparse.o
@@ -10,8 +10,6 @@ REGRESS = cube
 
 EXTRA_CLEAN = y.tab.c y.tab.h
 
-PG_CPPFLAGS = -I.
-
 SHLIB_LINK += $(filter -lm, $(LIBS))
 
 ifdef USE_PGXS

contrib/hstore/Makefile

-# $PostgreSQL: pgsql/contrib/hstore/Makefile,v 1.3 2007/02/09 17:04:00 petere Exp $
+# $PostgreSQL: pgsql/contrib/hstore/Makefile,v 1.4 2007/02/09 17:24:33 petere Exp $
 
 subdir = contrib/hstore
 top_builddir = ../..
 include $(top_builddir)/src/Makefile.global
 
-
-override CPPFLAGS := -I. $(CPPFLAGS)
-
 MODULE_big = hstore
 OBJS = hstore_io.o hstore_op.o hstore_gist.o crc32.o
 

contrib/pg_trgm/Makefile

-# $PostgreSQL: pgsql/contrib/pg_trgm/Makefile,v 1.5 2007/02/09 17:04:00 petere Exp $
-
-PG_CPPFLAGS = -I.
+# $PostgreSQL: pgsql/contrib/pg_trgm/Makefile,v 1.6 2007/02/09 17:24:33 petere Exp $
 
 MODULE_big = pg_trgm
 OBJS = trgm_op.o trgm_gist.o 

contrib/seg/Makefile

-# $PostgreSQL: pgsql/contrib/seg/Makefile,v 1.17 2006/04/03 18:47:41 petere Exp $
+# $PostgreSQL: pgsql/contrib/seg/Makefile,v 1.18 2007/02/09 17:24:33 petere Exp $
 
 MODULE_big = seg
 OBJS = seg.o segparse.o
@@ -9,8 +9,6 @@ REGRESS = seg
 
 EXTRA_CLEAN = y.tab.c y.tab.h
 
-PG_CPPFLAGS = -I.
-
 ifdef USE_PGXS
 PGXS := $(shell pg_config --pgxs)
 include $(PGXS)