External builds need tsearch include files

I tried to compile a custom tsearch dictionary as an external module,
but it couldn't find the tsearch include files in the server
installation. tsearch subdirectory needs to be added to
src/include/Makefile, otherwise they don't get installed:

*** src/include/Makefile 9 Dec 2005 21:19:35 -0000 1.21
--- src/include/Makefile 10 Sep 2007 19:53:54 -0000
***************
*** 18,24 ****

# Subdirectories containing headers for server-side dev
SUBDIRS = access bootstrap catalog commands executor lib libpq mb \
! nodes optimizer parser regex rewrite storage tcop utils \
port port/win32 port/win32/arpa port/win32/netinet port/win32/sys

# Install all headers
--- 18,24 ----

# Subdirectories containing headers for server-side dev
SUBDIRS = access bootstrap catalog commands executor lib libpq mb \
! nodes optimizer parser regex rewrite storage tcop tsearch utils \
port port/win32 port/win32/arpa port/win32/netinet port/win32/sys

# Install all headers

--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com