community/openjdk8: update soname workarounds for new rpath calculation

With !75167 (merged) abuild is able to determine more rpaths correctly. openjdk8 relies on abuild not finding all rpaths.

Fix build by using somask to exclude the invalid/duplicate sonames.

CC @ncopa Here is the fix. Should I do another MR to re-apply the abuild patch or do you want to do that?