GenerateExportHeader: support object libraries as well
GenerateExportHeader: support object libraries as well

Object libraries may also export symbols.

Change-Id: I8848586f90a887bbb4eaf8d2e5850c77dc5e7c82

sankhesh/VTK,jmerkow/VTK,ashray/VTK-EVM,johnkit/vtk-dev,sumedhasingla/VTK,sankhesh/VTK,jmerkow/VTK,hendradarwin/VTK,sankhesh/VTK,SimVascular/VTK,candy7393/VTK,mspark93/VTK,johnkit/vtk-dev,demarle/VTK,sankhesh/VTK,msmolens/VTK,mspark93/VTK,ashray/VTK-EVM,mspark93/VTK,sankhesh/VTK,SimVascular/VTK,ashray/VTK-EVM,johnkit/vtk-dev,mspark93/VTK,sumedhasingla/VTK,berendkleinhaneveld/VTK,keithroe/vtkoptix,keithroe/vtkoptix,keithroe/vtkoptix,ashray/VTK-EVM,gram526/VTK,jmerkow/VTK,jmerkow/VTK,demarle/VTK,gram526/VTK,hendradarwin/VTK,ashray/VTK-EVM,gram526/VTK,keithroe/vtkoptix,keithroe/vtkoptix,candy7393/VTK,jmerkow/VTK,hendradarwin/VTK,keithroe/vtkoptix,mspark93/VTK,SimVascular/VTK,candy7393/VTK,SimVascular/VTK,keithroe/vtkoptix,jmerkow/VTK,berendkleinhaneveld/VTK,msmolens/VTK,sankhesh/VTK,candy7393/VTK,jmerkow/VTK,sankhesh/VTK,SimVascular/VTK,demarle/VTK,gram526/VTK,berendkleinhaneveld/VTK,ashray/VTK-EVM,candy7393/VTK,msmolens/VTK,demarle/VTK,msmolens/VTK,hendradarwin/VTK,mspark93/VTK,sankhesh/VTK,gram526/VTK,candy7393/VTK,ashray/VTK-EVM,msmolens/VTK,johnkit/vtk-dev,demarle/VTK,berendkleinhaneveld/VTK,berendkleinhaneveld/VTK,berendkleinhaneveld/VTK,johnkit/vtk-dev,gram526/VTK,candy7393/VTK,SimVascular/VTK,sumedhasingla/VTK,sumedhasingla/VTK,johnkit/vtk-dev,sumedhasingla/VTK,demarle/VTK,gram526/VTK,mspark93/VTK,SimVascular/VTK,hendradarwin/VTK,mspark93/VTK,johnkit/vtk-dev,candy7393/VTK,sumedhasingla/VTK,hendradarwin/VTK,msmolens/VTK,jmerkow/VTK,msmolens/VTK,berendkleinhaneveld/VTK,sumedhasingla/VTK,hendradarwin/VTK,sumedhasingla/VTK,SimVascular/VTK,gram526/VTK,keithroe/vtkoptix,demarle/VTK,ashray/VTK-EVM,demarle/VTK,msmolens/VTK