dev-python/catkin_pkg: Bump to 0.4.20.

Add python 3.8

Package-Manager: Portage-2.3.99, Repoman-2.3.22
Signed-off-by: Alexis Ballier <aballier@gentoo.org>

dev-python/catkin_pkg/files/infinite_loop4.patch

@@ -0,0 +1,27 @@
+https://bugs.gentoo.org/show_bug.cgi?id=612860
+By Tim Rakowski
+We os.walk /usr with followlinks=True, but at least nodejs contains a "recursive" link in /usr/include/node
+
+Index: catkin_pkg-0.4.20/src/catkin_pkg/packages.py
+===================================================================
+--- catkin_pkg-0.4.20.orig/src/catkin_pkg/packages.py
++++ catkin_pkg-0.4.20/src/catkin_pkg/packages.py
+@@ -57,7 +57,9 @@ def find_package_paths(basepath, exclude
+     """
+     paths = []
+     real_exclude_paths = [os.path.realpath(p) for p in exclude_paths] if exclude_paths is not None else []
++    visited = set()
+     for dirpath, dirnames, filenames in os.walk(basepath, followlinks=True):
++        visited.add(dirpath)
+         if set(dirnames + filenames) & {'AMENT_IGNORE', 'CATKIN_IGNORE', 'COLCON_IGNORE'} or \
+             os.path.realpath(dirpath) in real_exclude_paths or \
+                 (exclude_subspaces and '.catkin' in filenames):
+@@ -68,7 +70,7 @@ def find_package_paths(basepath, exclude
+             del dirnames[:]
+             continue
+         # filter out hidden directories in-place
+-        dirnames[:] = [d for d in dirnames if not d.startswith('.')]
++        dirnames[:] = [d for d in dirnames if not d.startswith('.') and not os.path.realpath(os.path.join(dirpath, d)) in visited]
+     return paths
+ 
+