Added local lib directory for building IECoreGL against.
Added local lib directory for building IECoreGL against.

Alwnikrotikz/cortex-vfx,AlanZatarain/cortex-vfx,Alwnikrotikz/cortex-vfx,Alwnikrotikz/cortex-vfx,AlanZatarain/cortex-vfx,tectronics/cortex-vfx,AlanZatarain/cortex-vfx,tectronics/cortex-vfx,tectronics/cortex-vfx