opera: security and bugfix update to 12.15

Opera 12.15 is a recommended upgrade offering security and stability enhancements. It provides:
-fixed an issue where the search bar's default engine could be overridden by third-party apps;
-fixed a moderately severe issue;
-added safeguards against attacks on the RC4 encryption protocol;
-fixed an issue where cookies could be set for a top-level domain.

Fixed bugs
VUL-1: Opera 12.15 released
Selected Binaries
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