Mention that build doc may be crufty
Mention that build doc may be crufty

Add a note to the build instructions recommending users to refer to the
in-source version of the document if building an old or bleeding edge
version of LCM.

This doesn't precisely fix #117, but should mitigate such issues going
forward.

adeschamps/lcm,adeschamps/lcm,bluesquall/lcm,adeschamps/lcm,bluesquall/lcm,bluesquall/lcm,adeschamps/lcm,adeschamps/lcm,lcm-proj/lcm,lcm-proj/lcm,lcm-proj/lcm,lcm-proj/lcm,bluesquall/lcm,adeschamps/lcm,lcm-proj/lcm,adeschamps/lcm,lcm-proj/lcm,bluesquall/lcm,adeschamps/lcm,bluesquall/lcm,bluesquall/lcm,lcm-proj/lcm,lcm-proj/lcm