package/libcamera: bump to version caf25dc5cfd11b965316f02610d49ae3d886716b

package/libcamera: bump to version caf25dc5cfd11b965316f02610d49ae3d886716b

Buildroots autobuild identified a failure on GCC v6.2 and GCC v6.3,
producing the following warning (reported as error due to -Werror):

  event_dispatcher_poll.cpp:231:13: error: types may not be defined
      in a for-range-declaration [-Werror]

              for (const struct pollfd &pfd : pollfds) {
                         ^~~~~~
              cc1plus: all warnings being treated as errors

A fix has been integrated upstream, bump the package to incorporate it.

Fixes: http://autobuild.buildroot.net/results/f6dd4c60c04892c8b1669e6000fce7edb2b6349e/
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>