travis-ci: sleep after autoreconf as possible workaround
travis-ci: sleep after autoreconf as possible workaround

Sleeping after generating the configure file might help avoid
the build system sanity check fails.

gphoto/libgphoto2,gphoto/libgphoto2,gphoto/libgphoto2,gphoto/libgphoto2,gphoto/libgphoto2,gphoto/libgphoto2