[Lazarus] embed git version info

[Xiangrong Fang]

> I don't think that counts as "doing all the work for the OP" since he's
still got to figure
> out why it works :-)

I may leave some of you a wrong impression that I need spoon-feeding.  Let
me explain what I mean clearly:

While using {$I %DATE%}, I can write:

WriteLn('COMPILED: ' + {$I %DATE%});

i.e. the $I above returned a string without trying to parse it.  But with
{$I revision.inc} the file is parsed!   I just realized this after my first
reply to Graeme.   After think about the logic, I think this makes sense.
However, before I searched the forum for this problem, I didn't realize $I
has such usage (I used to use that for $I- or $I+).

I am a programmer, but I only write apps, not compiler or OS related stuff.
So sometime I may seem naive to "hardcore" or "real" programmers. Just like
I asked why SIGFPE happend on random places.   I don't think answer such
questions are spoon-feeding, just like the sigfpe question.

Sometime I have other considerations as to what is worth to do, e.g.  after
I remembered I have to compile my program under windows, I hesitated
whether I need to embed git rev into my program, because I don't want to
install git on my windows virtual machine, not that I ask step by step help
for how to do it, or write the script.
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