Fix leak & stale PCRE2_MD_COPIED_SUBJECT if pcre2_jit_match used with existing match context - #937
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The problem is not that pcre2_jit_match() needs to add support for PCRE2_COPY_MATCHED_SUBJECT. Instead, if the passed-in context somehow contains a previously-copied subject (by non-JIT matcher using a global or cached subject) then it will be leaked, and worse, incorrectly free'd later.
Fixes #920