Install 'bepo' keymap already included in Qemu source

The 'bepo' layout (a french dvorak-like keyboard layout) was added
about one year ago, (see commit 2a3c633c),
but I missed to declare to install it.
Signed-off-by: NFrédéric Boiteux <fboiteux@free.fr>
Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>

Makefile

@@ -250,7 +250,8 @@ distclean: clean
 
 KEYMAPS=da     en-gb  et  fr     fr-ch  is  lt  modifiers  no  pt-br  sv \
 ar      de     en-us  fi  fr-be  hr     it  lv  nl         pl  ru     th \
-common  de-ch  es     fo  fr-ca  hu     ja  mk  nl-be      pt  sl     tr
+common  de-ch  es     fo  fr-ca  hu     ja  mk  nl-be      pt  sl     tr \
+bepo
 
 ifdef INSTALL_BLOBS
 BLOBS=bios.bin sgabios.bin vgabios.bin vgabios-cirrus.bin \