I have been working on this all night. The problem was with the OPENGL32 interface on Windows.
The "Hello World" sample includes a call to glClear() which is an Open GL function. I commented that out and the program worked.
It was only when I downloaded the GLFW source and re-built GLFW3.dll that I discovered there was a set of test programs which used GLAD to reference OpenGL functions. By using the same methods I got "Hello World" working with the glClear call.
The GLAD method is actually described in "Getting Started", but it was only later that I found my way there.
It appears that on Windows 7, at least, you can't call OpenGL functions directly, you have to use an extension loader library like GLAD.
Anyway, all is now well, and I have finally got to first base!
I can now get on with the real objective of this exercise, which is to get the Chipmunk demo programs working.