Attempt to fix the Makefile.
Attempt to fix the Makefile.

Assuming this works, this is the last change for issue 214.

jskeet/nodatime,nodatime/nodatime,malcolmr/nodatime,BenJenkinson/nodatime,zaccharles/nodatime,malcolmr/nodatime,BenJenkinson/nodatime,malcolmr/nodatime,zaccharles/nodatime,zaccharles/nodatime,nodatime/nodatime,zaccharles/nodatime,zaccharles/nodatime,malcolmr/nodatime,jskeet/nodatime,zaccharles/nodatime