debian: don't distribute .la files with modules

Debian wants rid of .la files, and these module .la files shouldn't be
necessary on a Debian system.

debian/bootstrap.sh

@@ -516,7 +516,6 @@ EOF
 
 print_mod_install () {
   cat <<EOF
-/usr/lib/freeswitch/mod/${1}.la
 /usr/lib/freeswitch/mod/${1}.so
 EOF
 }