If building the api-documentation libnice requests dot or the build fails with:
| ../libnice-0.1.21/docs/reference/libnice/meson.build:70:0: ERROR: Program 'dot' not found or not executable
Signed-off-by: Markus Volk <f_l_k@t-online.de>
Signed-off-by: Khem Raj <raj.khem@gmail.com>