Put back some not-so-unnecessary-as-all-that := usages. Per buildfarm.

src/pl/plperl/GNUmakefile

 # Makefile for PL/Perl
-# $PostgreSQL: pgsql/src/pl/plperl/GNUmakefile,v 1.29 2007/02/09 15:56:00 petere Exp $
+# $PostgreSQL: pgsql/src/pl/plperl/GNUmakefile,v 1.30 2007/02/10 04:26:24 tgl Exp $
 
 subdir = src/pl/plperl
 top_builddir = ../../..
@@ -17,8 +17,8 @@ endif
 ifneq (,$(findstring yes, $(shared_libperl)$(allow_nonpic_in_shlib)))
 
 ifeq ($(PORTNAME), win32)
-perl_archlibexp = $(subst \,/,$(perl_archlibexp))
-perl_privlibexp = $(subst \,/,$(perl_privlibexp))
+perl_archlibexp := $(subst \,/,$(perl_archlibexp))
+perl_privlibexp := $(subst \,/,$(perl_privlibexp))
 perl_embed_ldflags = -L$(perl_archlibexp)/CORE -lperl58
 override CPPFLAGS += -DPLPERL_HAVE_UID_GID
 endif

src/pl/plpython/Makefile

-# $PostgreSQL: pgsql/src/pl/plpython/Makefile,v 1.27 2007/02/09 15:56:00 petere Exp $
+# $PostgreSQL: pgsql/src/pl/plpython/Makefile,v 1.28 2007/02/10 04:26:24 tgl Exp $
 
 subdir = src/pl/plpython
 top_builddir = ../../..
@@ -17,7 +17,7 @@ endif
 # and we have to remove -lpython from the link since we are building our own
 ifeq ($(PORTNAME), win32)
 shared_libpython = yes
-python_includespec = $(subst \,/,$(python_includespec))
+python_includespec := $(subst \,/,$(python_includespec))
 override python_libspec =
 endif