gnu: Remove coin3D@3.

* gnu/packages/graphics.scm (coin3D): Take the body from ...
(coin3D-4): ... this now-deprecated variable.
* gnu/packages/engineering.scm (freecad)[inputs]: Change from COIN3D-4 to COIN3D.
* gnu/packages/python-xyz.scm (python-pivy)[inputs]: Likewise.
* gnu/packages/qt.scm (soqt)[inputs]: Likewise.

gnu/packages/engineering.scm

@@ -2463,7 +2463,7 @@ (define-public freecad
            swig))
     (inputs
      (list boost
-           coin3D-4
+           coin3D
            double-conversion
            eigen
            fontconfig

gnu/packages/graphics.scm

@@ -134,6 +134,7 @@ (define-module (gnu packages graphics)
   #:use-module (guix hg-download)
   #:use-module ((guix licenses) #:prefix license:)
   #:use-module (guix packages)
+  #:use-module (guix deprecation)
   #:use-module (guix utils))
 
 (define-public mmm
@@ -1799,54 +1800,6 @@ (define-public opencsg
       (license license:gpl2))))
 
 (define-public coin3D
-  ;; The ‘4.0.0’ zip archive isn't stable, nor in fact a release.  See:
-  ;; https://bitbucket.org/Coin3D/coin/issues/179/coin-400-srczip-has-been-modified
-  (let ((revision 1)
-        (changeset "ab8d0e47a4de3230a8137feb39c142d6ba45f97d"))
-    (package
-      (name "coin3D")
-      (version
-       (simple-format #f "3.1.3-~A-~A" revision (string-take changeset 7)))
-      (source
-       (origin
-         (method hg-fetch)
-         (uri (hg-reference
-               (url "https://bitbucket.org/Coin3D/coin")
-               (changeset changeset)))
-         (file-name (git-file-name name version))
-         (sha256
-          (base32 "1ff44jz6lg4rylljvy69n1hcjh9y6achbv9jpn1cv2sf8cxn3r2j"))
-         (modules '((guix build utils)))
-         (snippet
-          '(begin
-             (for-each delete-file
-                       '("cfg/csubst.exe"
-                         "cfg/wrapmsvc.exe"))
-             #t))))
-      (build-system cmake-build-system)
-      (native-inputs
-       (list doxygen graphviz))
-      (inputs
-       (list boost freeglut glew))
-      (arguments
-       `(#:configure-flags
-         (list
-          "-DCOIN_BUILD_DOCUMENTATION_MAN=ON"
-          (string-append "-DBOOST_ROOT="
-                         (assoc-ref %build-inputs "boost")))))
-      (home-page "https://bitbucket.org/Coin3D/coin/wiki/Home")
-      (synopsis
-       "High-level 3D visualization library with Open Inventor 2.1 API")
-      (description
-       "Coin is a 3D graphics library with an Application Programming Interface
-based on the Open Inventor 2.1 API.  For those who are not familiar with
-Open Inventor, it is a scene-graph based retain-mode rendering and model
-interaction library, written in C++, which has become the de facto
-standard graphics library for 3D visualization and visual simulation
-software in the scientific and engineering community.")
-      (license license:bsd-3))))
-
-(define-public coin3D-4
   (package
     (name "coin3D")
     (version "4.0.0")
@@ -1896,6 +1849,9 @@ (define-public coin3D-4
 and engineering community.")
     (license license:bsd-3)))
 
+(define-deprecated coin3D-4 coin3D)
+(export coin3D-4)
+
 (define-public skia
   ;; Releases follow those of Chromium, about every 6 weeks.  The release
   ;; version can be found on this page:

gnu/packages/python-xyz.scm

@@ -28118,7 +28118,7 @@ (define-public python-pivy
             libice
             soqt
             glew
-            coin3D-4))
+            coin3D))
     (home-page "https://github.com/coin3d/pivy")
     (synopsis "Python bindings to Coin3D")
     (description

gnu/packages/qt.scm

@@ -4234,7 +4234,7 @@ (define-public soqt
     (native-inputs
       (list pkg-config cmake))
     (inputs
-      (list qtbase-5 coin3D-4))
+      (list qtbase-5 coin3D))
     (home-page "https://github.com/coin3d/soqt")
     (synopsis "Qt GUI component toolkit library for Coin")
     (description "SoQt is a Qt GUI component toolkit library for Coin.  It is