current implementation of find_package(Coin3D)

[reox]

I'm not sure if this is a problem but I found that the current implementation of find_package(Coin3D) will run into the manual search even if cmake files for coin are available (for example on debian sid).

For me, https://github.com/FreeCAD/FreeCAD/blob ... .cmake#L80 just prints out:

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-- Found PkgConfig: /usr/bin/pkg-config (found version "0.29") 
-- Checking for module 'Coin'
--   No package 'Coin' found

but does not set COIN3D_FOUND, thus the next lines will be active, falling back into manual search which is not necessary.

I think the first line in FindCoind3D.cmake should be something like:

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find_package(Coin3D)
if(NOT COIN3D_FOUND)
    # Do the manual search...