Convert Mac modifier keys layout to PC keyboard format

Xmodmap

!mod1 = Alt_L
!mod4 = Super_L Super_R
!mod5 = ISO_Level3_Shift (Alt_gr)

! Control_L  Alt_L     Super_L   Super_R           ISO_Level3_Shift // Old keys
! 37         64        133       134               108              // Keycodes
! Control_L  Super_L   Alt_L     ISO_Level3_Shift  Control_R I      // New keys


keycode 37 = Control_L
keycode 108 = Control_R
keycode 134 = ISO_Level3_Shift
keycode 64 = Super_L
keycode 133 = Alt_L

clear control
clear mod1
clear mod4
clear mod5

add control = Control_L Control_R
add mod1 = Alt_L
add mod4 = Super_L
add mod5 = ISO_Level3_Shift