Add inmem handler

Author: knizhnik

src/backend/access/Makefile

@@ -9,6 +9,6 @@ top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
 SUBDIRS	    = brin common gin gist hash heap index nbtree rmgrdesc spgist \
-			  table tablesample transam immem
+			  table tablesample transam inmem
 
 include $(top_srcdir)/src/backend/common.mk