CMake: optionally disable OBJ, STL & GPencil SVG support

The following CMake options have been added (enabled by default),
except for the lite build configuration.

- WITH_IO_STL
- WITH_IO_WAVEFRONT_OBJ
- WITH_IO_GPENCIL (for grease pencil SVG importing).
  Note that it was already possible to disable grease pencil export
  by disabling WITH_PUGIXML & WITH_HARU.

This is intended to keep the lite builds fast and small for building,
linking & execution.

Reviewed By: iyadahmed2001, aras_p, antoniov, mont29

Ref D15141

source/blender/python/intern/bpy_app_build_options.c

@@ -43,6 +43,9 @@ static PyStructSequence_Field app_builtopts_info_fields[] = {
     {"mod_oceansim", NULL},
     {"mod_remesh", NULL},
     {"collada", NULL},
+    {"io_wavefront_obj", NULL},
+    {"io_stl", NULL},
+    {"io_gpencil", NULL},
     {"opencolorio", NULL},
     {"openmp", NULL},
     {"openvdb", NULL},
@@ -251,6 +254,24 @@ static PyObject *make_builtopts_info(void)
   SetObjIncref(Py_False);
 #endif
 
+#ifdef WITH_IO_WAVEFRONT_OBJ
+  SetObjIncref(Py_True);
+#else
+  SetObjIncref(Py_False);
+#endif
+
+#ifdef WITH_IO_STL
+  SetObjIncref(Py_True);
+#else
+  SetObjIncref(Py_False);
+#endif
+
+#ifdef WITH_IO_GPENCIL
+  SetObjIncref(Py_True);
+#else
+  SetObjIncref(Py_False);
+#endif
+
 #ifdef WITH_OCIO
   SetObjIncref(Py_True);
 #else