pfstools: fix build of pfsglview with newer cmake

The CMake build configuration for pfsglview used an internal variable,
GLUT_glut_LIBRARY, to link with GLUT, which seems to have stopped
working when CMake was bumped from 3.21 in 3.22 in nixpkgs#147818. Use
the officially documented GLUT_LIBRARIES instead.

pkgs/tools/graphics/pfstools/default.nix

@@ -36,7 +36,7 @@ mkDerivation rec {
     libGLU libGL freeglut
   ]) ++ lib.optional enableUnfree (opencv2.override { enableUnfree = true; });
 
-  patches = [ ./threads.patch ./pfstools.patch ./pfsalign.patch ];
+  patches = [ ./glut.patch ./threads.patch ./pfstools.patch ./pfsalign.patch ];
 
   meta = with lib; {
     homepage = "http://pfstools.sourceforge.net/";

pkgs/tools/graphics/pfstools/glut.patch

@@ -0,0 +1,12 @@
+--- a/src/pfsglview/CMakeLists.txt	2022-04-04 23:21:11.164016369 +0300
++++ b/src/pfsglview/CMakeLists.txt	2022-04-04 23:21:32.757878750 +0300
+@@ -11,8 +11,7 @@
+ 
+ add_executable(pfsglview pfsglview.cpp picture_io.cpp module.cpp m_histogram.cpp m_status.cpp m_on_screen_display.cpp)
+ 
+-# TODO: Use ${GLUT_LIBRARY} instead.
+-target_link_libraries(pfsglview ${OPENGL_LIBRARIES} ${GLUT_glut_LIBRARY} pfs)
++target_link_libraries(pfsglview ${OPENGL_LIBRARIES} ${GLUT_LIBRARIES} pfs)
+ 
+ install (TARGETS pfsglview DESTINATION bin)
+ install (FILES pfsglview.1 DESTINATION ${MAN_DIR})