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
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update to LCG_102b_ATLAS_17 the only change vs LCG_102b_ATLAS_15 is the patched H7 version