gnu: opencsg: Update to 1.8.2.

* gnu/packages/graphics.scm (opencsg): Update to 1.8.2.
[build-system]: Switch to cmake build system.
[arguments]<#:phases>[configure]: Remove replacement.
[skip-example]: Delete phase.
[check]: Delete phase.

Change-Id: Iba5ee7f2d3a95b2df8226a5f4d42baa2806eec84
Signed-off-by: Danny Milosavljevic <dannym@friendly-machines.com>

gnu/packages/graphics.scm

@@ -2212,7 +2212,7 @@ and GPU architectures.")
   (let ((dot-to-dash (lambda (c) (if (char=? c #\.) #\- c))))
     (package
       (name "opencsg")
-      (version "1.4.2")
+      (version "1.8.1")
       (source
        (origin
          (method git-fetch)
@@ -2224,18 +2224,12 @@ and GPU architectures.")
          (file-name (git-file-name name version))
          (sha256
           (base32
-           "00m4vs6jn3scqczscc4591l1d6zg6anqp9v1ldf9ymf70rdyvm7m"))))
-      (build-system gnu-build-system)
+           "0q19mswyjlampdssqgik4q7j08fbj0dhxdr9mzg0i7ma2b2rhdhw"))))
+      (build-system cmake-build-system)
       (arguments
-       `(#:phases
-         (modify-phases %standard-phases
-           (replace 'configure
-             (lambda* (#:key outputs #:allow-other-keys)
-               (substitute* "src/Makefile"
-                 (("/usr/local") (assoc-ref outputs "out")))
-               #t))
-           (add-before 'build 'skip-example
-             (lambda _ (chdir "src") #t)))))
+       `(#:phases (modify-phases %standard-phases
+                    ;; library has no tests
+                    (delete 'check))))
       (inputs
        (list glew freeglut))
       (synopsis "Library for rendering Constructive Solid Geometry (CSG)")