latest intel msdk libdir not found by meson

It seems that the intel media sdk (version 2018.3.1) places the libraries into /lib64 instead of /lib/lin_x64 or /lib/x64 ; the following fixes it, should i create a merge request or attach a patch ?

index fa4fa3cc3..bf3fb2179 100644
--- a/sys/msdk/meson.build
+++ b/sys/msdk/meson.build
@@ -45,7 +45,7 @@ have_msdk = false
 msdk_dep = []
 
 if msdk_root != ''
-  msdk_libdir = [msdk_root + '/lib/lin_x64', msdk_root + '/lib/x64']
+  msdk_libdir = [msdk_root + '/lib/lin_x64', msdk_root + '/lib/x64', msdk_root + '/lib64']
   msdk_incdir = include_directories(msdk_root + '/include')
   msdk_lib = cxx.find_library('mfx', dirs: msdk_libdir, required: msdk_option)
   if host_machine.system() == 'windows'