Log Message:
devel/scons4: Update to 4.8.1

(Built but not used; this is labeled a micro and I'm believing
upstream.  Permission granted to anyone to revert without asking me if
this causes trouble.)

upstream NEWS:

CHANGED/ENHANCED EXISTING FUNCTIONALITY

    env.Dump() previously accepted a single optional "key" argument.
    It now accepts any number of optional "key" arguments; any supplied
    keys will be serialized with their values in a Python dict style.
    As a result there is a small change in behavior: if a single key
    argument is given, where it previously would return a string containing
    just the value, now it will return a string that looks like a dictionary
    including the key. For example, from "'gcc'" to "{'CC': \ 
'gcc'}".
    This should not have any impact as the result of calling Dump is
    intended for diagnostic output, not for use by other interfaces.