manually trigger build of Gdml example
The GdmlExample depends on the TGeoPlugin of ACTS, which is only build on demand. Therefore a flag was introduced BUILD_GDML_EXAMPLE which builds the Gdml example on demand.
The GdmlExample depends on the TGeoPlugin of ACTS, which is only build on demand. Therefore a flag was introduced BUILD_GDML_EXAMPLE which builds the Gdml example on demand.