[PATCH v2] kernel-shark: Use cmake imported targets instead of variables

["Tzvetomir Stoyanov (VMware)" <tz.stoyanov@xxxxxxxxx>]

Using cmake imported targets instead of package variables is
recommended way to define package dependencies.

The GLUT_LIBRARY cmake variable was renamed in cmake 3.22.1, which
breaks the Kernel Shark build with the latest cmake.

Reported-by: Michal Sojka <michal.sojka@xxxxxxx>
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@xxxxxxxxx>
---
 src/CMakeLists.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index babb9c1..9e0b4ae 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -59,8 +59,8 @@ if (OPENGL_FOUND)
                                      KsPlugins.cpp)
 
     target_link_libraries(kshark-plot  kshark
-                                       ${GLUT_LIBRARY}
-                                       ${OPENGL_LIBRARIES})
+                                       GLUT::GLUT
+                                       OpenGL::GLU)
 
     set_target_properties(kshark-plot PROPERTIES  SUFFIX ".so.${KS_VERSION_STRING}")
     install(TARGETS kshark-plot
-- 
2.34.1