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Adjust adjlon to use canonical M_PI defines (#665)

A year or so ago, @micahcochran put quite some effort into rationalizing the PI usage in PROJ.4, by ensuring that a useful number of M_PI related constants were defined in projects.h.

But apparently adjlon.c was left behind still using its own set of definitions - perhaps because it bends the values slightly, to avoid unwanted sign switching near the date line.

In this PR the "bending trick" is reimplemented using the rationalized M_PI constants only.

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