ENH: Automatic enabling of the -fPIC flag for external modules
ENH: Automatic enabling of the -fPIC flag for external modules

Enabling the "Position Independent Code" option for the external modules
of ITK in order to avoid the following error message during compilation:
"some_librairy" can not be used when making a shared object; recompile with -fPIC"

This error particularly appears when trying to wrap an ITK external module
for python

richardbeare/ITK,malaterre/ITK,malaterre/ITK,spinicist/ITK,BRAINSia/ITK,vfonov/ITK,stnava/ITK,LucasGandel/ITK,vfonov/ITK,malaterre/ITK,Kitware/ITK,stnava/ITK,thewtex/ITK,malaterre/ITK,malaterre/ITK,InsightSoftwareConsortium/ITK,BRAINSia/ITK,InsightSoftwareConsortium/ITK,stnava/ITK,spinicist/ITK,spinicist/ITK,hjmjohnson/ITK,Kitware/ITK,blowekamp/ITK,vfonov/ITK,blowekamp/ITK,hjmjohnson/ITK,hjmjohnson/ITK,hjmjohnson/ITK,stnava/ITK,fbudin69500/ITK,fbudin69500/ITK,blowekamp/ITK,richardbeare/ITK,vfonov/ITK,richardbeare/ITK,richardbeare/ITK,Kitware/ITK,thewtex/ITK,spinicist/ITK,LucasGandel/ITK,InsightSoftwareConsortium/ITK,stnava/ITK,fbudin69500/ITK,stnava/ITK,spinicist/ITK,thewtex/ITK,LucasGandel/ITK,BRAINSia/ITK,BRAINSia/ITK,blowekamp/ITK,stnava/ITK,blowekamp/ITK,fbudin69500/ITK,vfonov/ITK,thewtex/ITK,stnava/ITK,BRAINSia/ITK,stnava/ITK,hjmjohnson/ITK,Kitware/ITK,malaterre/ITK,Kitware/ITK,vfonov/ITK,thewtex/ITK,spinicist/ITK,spinicist/ITK,InsightSoftwareConsortium/ITK,thewtex/ITK,spinicist/ITK,vfonov/ITK,LucasGandel/ITK,spinicist/ITK,hjmjohnson/ITK,fbudin69500/ITK,InsightSoftwareConsortium/ITK,LucasGandel/ITK,LucasGandel/ITK,InsightSoftwareConsortium/ITK,malaterre/ITK,fbudin69500/ITK,fbudin69500/ITK,InsightSoftwareConsortium/ITK,LucasGandel/ITK,hjmjohnson/ITK,thewtex/ITK,LucasGandel/ITK,richardbeare/ITK,vfonov/ITK,blowekamp/ITK,richardbeare/ITK,BRAINSia/ITK,fbudin69500/ITK,malaterre/ITK,Kitware/ITK,richardbeare/ITK,BRAINSia/ITK,Kitware/ITK,vfonov/ITK,blowekamp/ITK,blowekamp/ITK,malaterre/ITK