Enable transforms modules to build and test on Cygwin.

This still doesn't work correctly with Python 3, but I am committing
this so we can get Cygwin buildfarm members building with Python 2.

contrib/hstore_plperl/Makefile

@@ -35,6 +35,10 @@ override CPPFLAGS += -DPLPERL_HAVE_UID_GID -Wno-comment
 SHLIB_LINK += ../hstore/libhstore.a $(wildcard ../../src/pl/plperl/libperl*.a)
 endif
 
+ifeq ($(PORTNAME), cygwin)
+SHLIB_LINK += -L../hstore -l hstore $(perl_embed_ldflags)
+endif
+
 # As with plperl we need to make sure that the CORE directory is included
 # last, probably because it sometimes contains some header files with names
 # that clash with some of ours, or with some that we include, notably on

contrib/hstore_plpython/Makefile

@@ -33,6 +33,11 @@ ifeq ($(PORTNAME), win32)
 SHLIB_LINK += ../hstore/libhstore.a $(wildcard ../../src/pl/plpython/libpython*.a) $(wildcard ../../src/pl/plpython/libplpython*.a)
 endif
 
+ifeq ($(PORTNAME), cygwin)
+SHLIB_LINK += -L../hstore -lhstore -L../../src/pl/plpython \
+	-lplpython$(python_majorversion) $(python_libspec)
+endif
+
 REGRESS_OPTS += --load-extension=hstore
 ifeq ($(python_majorversion),2)
 REGRESS_OPTS += --load-extension=plpythonu --load-extension=hstore_plpythonu

contrib/ltree_plpython/Makefile

@@ -33,6 +33,11 @@ ifeq ($(PORTNAME), win32)
 SHLIB_LINK += $(wildcard ../../src/pl/plpython/libpython*.a) $(wildcard ../../src/pl/plpython/libplpython*.a)
 endif
 
+ifeq ($(PORTNAME), cygwin)
+SHLIB_LINK += -L../ltree -lltree -L../../src/pl/plpython \
+	-lplpython$(python_majorversion) $(python_libspec)
+endif
+
 REGRESS_OPTS += --load-extension=ltree
 ifeq ($(python_majorversion),2)
 REGRESS_OPTS += --load-extension=plpythonu --load-extension=ltree_plpythonu