[fpc-pascal] OSX fails to build apps

[Anthony Walter]

There now exists a problem building apps on OSX using FPC trunk sources.

Issue: Any attempt to build with a form present causes a popup dialog to be
show with the message "Streaming Error Unable to Form1:TForm1 Abstract
method called"

This error will occur even if you're not trying to compile a project with a
form. For instance if you have a form project open, then open a package and
try to build the package you will get this error. But if you start a new
console project without a form, and then open and compile the same package,
the package compilation or installation works.

Steps to reproduce:

Check out FPC trunk sources on OSX
Make FPC (3.1.1 the default should be darwin i386)
Configure the compiler and paths
Rebuild Lazarus with the new compiler
Open Lazarus
A blank form project will be opened by default
Press build and you will receive this error

Notes:

At first I tried new Lazarus with trunk sources. When i received this
error, I copied my existing and working Lazarus and compiled with the new
FPC from trunk. The same behavior is exhibited, thus leading me to believe
the problem s with FPC and not Lazarus.

I will attempt older FPC revisions before filing an official bug report. In
the mean time if anyone can confirm or test this issue your efforts would
be appreciated.
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