ebd: update EAPI 8 --disable-static rule per PMS update

[mgorny]

Update the EAPI 8 --disable-static to be emitted when either
--disable-static or --enable-static occurs in configure --help output.
This is necessary to handle libtool packages correctly, and this is how
it was initially implemented in Portage. PMS is being updated to match.

Bug: https://bugs.gentoo.org/814368

[codecov]

Codecov Report

Merging #330 (6c57606) into master (f5fa26b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #330   +/-   ##
=======================================
  Coverage   53.58%   53.58%           
=======================================
  Files         141      141           
  Lines       21804    21804           
  Branches     4594     4594           
=======================================
  Hits        11684    11684           
  Misses       9470     9470           
  Partials      650      650           

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[ulm]

LGTM