Add preliminary FreeBSD support to fix multimedia/py-moviepy

- Bump PORTREVISION for package change

PR:		227363
Reported by:	yuri
Reference:	Zulko/moviepy#756
		https://github.com/sunpoet/imageio/commit/0a4562bfee1efd7ccb95a98f16ad1519dc2e2f63


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@475820 35697150-7ecd-e111-bb59-0022644237b5

graphics/py-imageio/files/patch-imageio-core-util.py

@@ -0,0 +1,11 @@
+--- imageio/core/util.py.orig
++++ imageio/core/util.py
+@@ -550,6 +550,8 @@ def get_platform():
+         plat = 'win%i'
+     elif sys.platform.startswith('darwin'):
+         plat = 'osx%i'
++    elif sys.platform.startswith('freebsd'):
++        plat = 'freebsd%i'
+     else:  # pragma: no cover
+         return None
+