  [libvirt] [PATCH] build: regenerate .png files  We don't
expect people to have tools installed to regenerate .png from
.fig by default.  However, since commit 5eb3df8, several .fig
files were updated without regenerating the .png file, and as a
result, 'make dist' ends up regenerating those five files, or
worse, failing because of missing tools.  Additionally, the
generation of .png files is nondeterministic (the resulting
files contain a timestamp), which means prior to this patch,
running 'make dist' from two checkouts will end up producing
different tarball contents (two 'make dist' runs will always
produce different tar files, since tarballs also contain
timestamps; but unpacking the tarballs and doing a recursive
diff will show if the contents are unchanged).  Running 'make
*.png' in the docs directory and committing the result means the
timestamps are now up-to-date, and 'make dist' no longer has
anything to do.  This gets us closer to the goal of two
checkouts being able to produce the same tarball.