Patch for CGAL-5.0

I have not bumped `Release:` on purpose, because the previous build
attempt failed.

openscad-2019.05-CGAL-5.0.patch

@@ -0,0 +1,20 @@
+diff -up openscad-2019.05/features/cgal.prf.bak openscad-2019.05/features/cgal.prf
+--- openscad-2019.05/features/cgal.prf.bak	2019-10-02 15:35:12.951314278 +0200
++++ openscad-2019.05/features/cgal.prf	2019-10-02 15:44:04.034063578 +0200
+@@ -1,4 +1,6 @@
+-DEFINES += ENABLE_CGAL
++DEFINES += ENABLE_CGAL CGAL_HEADER_ONLY
++
++QMAKE_CXXFLAGS += -std=c++14
+ 
+ # Optionally specify location of CGAL using the 
+ # CGALDIR env. variable
+@@ -9,7 +11,7 @@ CGAL_DIR = $$(CGALDIR)
+   message("CGAL location: $$CGAL_DIR")
+ }
+ 
+-LIBS += -lCGAL -lmpfr -lgmp
++LIBS += -lmpfr -lgmp
+ 
+ *g++* {
+   QMAKE_CXXFLAGS += -frounding-math

openscad.spec

@@ -19,6 +19,10 @@ Patch0:         %{name}-polyclipping.patch
 # https://github.com/openscad/openscad/issues/2965
 Patch1:         %{github}/pull/2973.patch
 
+# Compatibility with CGAL-5.0
+# https://github.com/openscad/openscad/pull/3083
+Patch2:         openscad-2019.05-CGAL-5.0.patch
+
 BuildRequires:  CGAL-devel >= 3.6
 BuildRequires:  ImageMagick
 BuildRequires:  Xvfb
@@ -213,6 +217,7 @@ cd -
 %changelog
 * Wed Oct 02 2019 Miro Hrončok <mhroncok@redhat.com> - 2019.05-6
 - Rebuilt for CGAL becoming header only
+- Add a patch to the QMake configuration, for CGAL 5.0
 
 * Sun Sep 22 2019 Orion Poplawski <orion@nwra.com>
 - Rebuild for double-conversion 3.1.5