Enable opengl event if with_vtk is false

- Enable opengl event if with_vtk is false as done in PCL CMakeLists.txt

recipes/pcl/all/conanfile.py

@@ -105,8 +105,7 @@ def requirements(self):
             self.requires("libusb/1.0.26")
         if self.options.with_pcap:
             self.requires("libpcap/1.10.4")
-        if self.options.with_opengl and self.options.with_vtk:
-            # OpenGL is only used if VTK is available
+        if self.options.with_opengl:
             self.requires("opengl/system")
             self.requires("freeglut/3.4.0")
             self.requires("glew/2.2.0")
@@ -119,11 +118,6 @@ def requirements(self):
         # self.requires("dssdk/x.x.x")
         # self.requires("rssdk/x.x.x")
 
-    def package_id(self):
-        if self.info.options.with_vtk:
-            # with_opengl has no effect if VTK is not available
-            self.info.options.with_opengl = False
-
     def validate(self):
         if self.settings.compiler.cppstd:
             check_min_cppstd(self, self._min_cppstd)