[Lazarus] IdeIntf was split to BuildIntf

[Juha Manninen]

IdeIntf package was refactored, non-GUI parts were moved to a new BuildIntf
package.
Commit r62795 by Mattias (although I did the actual split).

Rebuilding the sources after r62795 using a Lazarus executable built before
it gives an error. The old IDE does not know where the BuildInf package is.
The easiest cure is to open components/buildide.lpk in the IDE.
Building succeeds once the IDE has seen it.
See issue :
 https://bugs.freepascal.org/view.php?id=36819

Juha
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