closes #1294

./autogen.sh --prefix=/usr && make
...
  GEN      caja.desktop.in
  GEN      caja.desktop
  GEN      caja-home.desktop.in
  GEN      caja-home.desktop
  GEN      caja-computer.desktop.in
  GEN      caja-computer.desktop
  GEN      caja-folder-handler.desktop.in
  GEN      caja-folder-handler.desktop
  GEN      caja-file-management-properties.desktop.in
  GEN      caja-file-management-properties.desktop
  GEN      caja-browser.desktop.in
  GEN      caja-browser.desktop
  GEN      caja-autorun-software.desktop.in
  GEN      caja-autorun-software.desktop
  GEN      mate-network-scheme.desktop.in
  GEN      mate-network-scheme.desktop
...
grep Exec= data/*.desktop
data/caja-autorun-software.desktop:TryExec=/usr/bin/caja-autorun-software
data/caja-autorun-software.desktop:Exec=/usr/bin/caja-autorun-software %u
data/caja-browser.desktop:TryExec=/usr/bin/caja
data/caja-browser.desktop:Exec=/usr/bin/caja --no-desktop --browser %U
data/caja-computer.desktop:TryExec=/usr/bin/caja
data/caja-computer.desktop:Exec=/usr/bin/caja --no-desktop computer:
data/caja.desktop:Exec=/usr/bin/caja
data/caja-file-management-properties.desktop:Exec=/usr/bin/caja-file-management-properties
data/caja-folder-handler.desktop:TryExec=/usr/bin/caja
data/caja-folder-handler.desktop:Exec=/usr/bin/caja --no-desktop %U
data/caja-home.desktop:TryExec=/usr/bin/caja
data/caja-home.desktop:Exec=/usr/bin/caja --no-desktop
data/mate-network-scheme.desktop:TryExec=/usr/bin/caja
data/mate-network-scheme.desktop:Exec=/usr/bin/caja --no-desktop network:

Also add NoDisplay=true to make sure they do not show up in the menu.