Enhanced cmake part for OpenBSD (#3086)

* Fixed compile on OpenBSD

* Changed to not use seperate UNIX for cmake

cmake/LibraryConfigurations.cmake

@@ -43,14 +43,15 @@ if (${PLATFORM} MATCHES "Desktop")
         if ("${OPENGL_LIBRARIES}" STREQUAL "")
             set(OPENGL_LIBRARIES "GL")
         endif ()
+        
+        set(LIBS_PRIVATE m atomic pthread ${OPENGL_LIBRARIES} ${OSS_LIBRARY})
 
         if ("${CMAKE_SYSTEM_NAME}" MATCHES "(Net|Open)BSD")
             find_library(OSS_LIBRARY ossaudio)
+            set(LIBS_PRIVATE m pthread ${OPENGL_LIBRARIES} ${OSS_LIBRARY})
         endif ()
 
-        set(LIBS_PRIVATE m atomic pthread ${OPENGL_LIBRARIES} ${OSS_LIBRARY})
-
-        if (USE_AUDIO)
+        if (NOT "${CMAKE_SYSTEM_NAME}" MATCHES "(Net|Open)BSD" AND USE_AUDIO)
             set(LIBS_PRIVATE ${LIBS_PRIVATE} dl)
         endif ()
     endif ()