Update build_externals.sh to LCG_102b_ATLAS_17
update to LCG_102b_ATLAS_17 the only change vs LCG_102b_ATLAS_15 is the patched H7 version
Edited by Ewelina Maria Lobodzinska
update to LCG_102b_ATLAS_17 the only change vs LCG_102b_ATLAS_15 is the patched H7 version