Updating py27-* ports

[Pau Amma]

On 2020-07-04 16:30, Carmel wrote:
> What I have never been able to get a definitive answer to is exactly
> what the "+" does or if it is even needed, I have seen
> 'default_versions" both with and without it.

The way I understand it, += appends. Thus:
FOO=bar
FOO+=quux
will result in FOO having the value bar quux. Sometimes you will see += 
used even for what looks like the first of a series of assignments. This 
works because the initial value is the empty string, and is usually done 
to add to any non-empty default or initial value the variable may be 
getting elsewhere (now or later) or to future-proof against needing to 
add something before the first assignment and forgetting to change it 
from = to +=.

See also, "Variable assignment modifiers" in the make manual page.