Linking flags for embedded mode.

Demos/embed/Makefile

 # Makefile for creating our standalone Cython program
 PYVERSION=$(shell python -c "import sys; print sys.version[:3]")
 PYPREFIX=$(shell python -c "import sys; print sys.prefix")
+LINKFORSHARED=$(shell python -c "import distutils.sysconfig; print distutils.sysconfig.get_config_var('LINKFORSHARED')")
 INCLUDES=-I$(PYPREFIX)/include/python$(PYVERSION)
 
 embedded: embedded.o
-	gcc -o $@ $^ -lpython$(PYVERSION)
+	gcc -o $@ $^ $(LINKFORSHARED) -lpython$(PYVERSION) -lm -lpthread -ldl -lutil
 
 embedded.o: embedded.c
 	gcc -c $^ $(INCLUDES)