Update finding glfw

For the latest version of the glfw library, you need to find a packaged
named glfw3 (not GLFW).

tests/CMakeLists.txt

@@ -25,14 +25,15 @@ OpenGL contexts. Supported values are GLUT and GLFW."
       MESSAGE(STATUS "Cannot find GLUT library. OpenGL tests disabled.")
     ENDIF (GLUT_FOUND)
   ELSEIF (ICET_OPENGL_WINDOW_LIBRARY STREQUAL GLFW)
-    FIND_PACKAGE(GLFW)
-    IF (GLFW_FOUND)
-      INCLUDE_DIRECTORIES(${GLFW_INCLUDE_DIR})
+    FIND_PACKAGE(glfw3)
+    IF (glfw3_FOUND)
+      #INCLUDE_DIRECTORIES(${GLFW_INCLUDE_DIR})
+      SET(GLFW_LIBRARY glfw)
       SET(ICET_TESTS_USE_OPENGL 1)
       SET(ICET_TESTS_USE_GLFW 1)
-    ELSE (GLFW_FOUND)
+    ELSE (glfw3_FOUND)
       MESSAGE(WARNING "Cannot find GLFW library. OpenGL tests disabled.")
-    ENDIF (GLFW_FOUND)
+    ENDIF (glfw3_FOUND)
   ELSE ()
     MESSAGE(SEND_ERROR "Invalid value for ICET_OPENGL_WINDOW_LIBRARY: ${ICET_OPENGL_WINDOW_LIBRARY}")
   ENDIF ()