ENH: Follow up commit to fix itkBoundingBox with LEGACY support
ENH: Follow up commit to fix itkBoundingBox with LEGACY support

When compiling ITK with ITK_LEGACY_SILENT set to ON, e.g. when compiling
with Python wrapping ON, ITK was not compiling because itkVectorContainer
class does not have a member function called `clear()` or a function called
`reserve()`. This regression was introduced in [1] and the PR is was a
follow up of.

[1] 5b508a5e88bb70ec6667569f6adcf9c915225f08

LucasGandel/ITK,BRAINSia/ITK,richardbeare/ITK,malaterre/ITK,malaterre/ITK,BRAINSia/ITK,richardbeare/ITK,malaterre/ITK,richardbeare/ITK,BRAINSia/ITK,BRAINSia/ITK,hjmjohnson/ITK,vfonov/ITK,LucasGandel/ITK,Kitware/ITK,thewtex/ITK,thewtex/ITK,malaterre/ITK,hjmjohnson/ITK,hjmjohnson/ITK,InsightSoftwareConsortium/ITK,Kitware/ITK,InsightSoftwareConsortium/ITK,thewtex/ITK,thewtex/ITK,InsightSoftwareConsortium/ITK,InsightSoftwareConsortium/ITK,LucasGandel/ITK,hjmjohnson/ITK,LucasGandel/ITK,malaterre/ITK,vfonov/ITK,Kitware/ITK,BRAINSia/ITK,vfonov/ITK,Kitware/ITK,hjmjohnson/ITK,BRAINSia/ITK,InsightSoftwareConsortium/ITK,hjmjohnson/ITK,thewtex/ITK,LucasGandel/ITK,hjmjohnson/ITK,InsightSoftwareConsortium/ITK,vfonov/ITK,thewtex/ITK,malaterre/ITK,malaterre/ITK,richardbeare/ITK,vfonov/ITK,BRAINSia/ITK,richardbeare/ITK,thewtex/ITK,vfonov/ITK,vfonov/ITK,vfonov/ITK,Kitware/ITK,Kitware/ITK,InsightSoftwareConsortium/ITK,Kitware/ITK,richardbeare/ITK,malaterre/ITK,LucasGandel/ITK,vfonov/ITK,richardbeare/ITK,malaterre/ITK,LucasGandel/ITK,LucasGandel/ITK