[Lazarus] Strip debug info

[Alexander Klenin]

While I am personally ambivalent about the default state of -Xg switch,
I'd like to point out another use case where it matters:
compiling on Windows on slow machine with antivirus installed.

When I tried to persuade my students to switch to Lazarus from Delphi,
I've got many complaints about Lazarus being too slow.
About a third of these complaints were fixed by either excluding
Lazarus directory from AV's monitoring list, or turning -Xg on.

-- 
Alexander S. Klenin