Add a ./run script for running programs from the local directory.

With this script you can run libvirt programs without needing to
install them first.  You just have to do for example:

  ./run ./tools/virsh [args ...]

If you are already in the tools/ subdirectory, then the following
command will also work:

  ../run ./virsh [...]

You can also run the C programs under valgrind like this:

  ./run valgrind [valgrind opts...] ./program

or under gdb:

  ./run gdb --args ./program

This also works with sudo (eg. if you need root access for libvirt):

  sudo ./run ./tools/virsh list --all

Derived from libguestfs and simplified.  The ./run script in
libguestfs is much more sophisticated:

https://github.com/libguestfs/libguestfs/blob/master/run.in

docs/compiling.html.in

@@ -101,18 +101,11 @@
 
     <p>
       It is also possible to run virsh directly from the source tree
+      using the ./run script (which sets some environment variables):
     </p>
 
     <pre>
-      $ ./tools/virsh ....
+      $ ./run ./tools/virsh ....
     </pre>
-
-    <p>
-      A normal configuration of libvirt will build hypervisor drivers
-      as loadable modules. When running from a non-installed source
-      tree, libvirtd will attempt to find the modules from the same
-      source tree. If this is not possible though, you can explicitly
-      set <code>LIBVIRT_DRIVER_DIR=/path/to/source/tree/src/.libs</code>
-    </p>
   </body>
 </html>