ENH: Remove Utilities/C99 from GDCM sync script
ENH: Remove Utilities/C99 from GDCM sync script

Utilities/C99 directory has been removed since :

d77e24c4a3e0 Remove C99 compat

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