Do not use __builtin_unreachable() in PCRE2_ASSERT() #485
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__builting_unreachable() implementation is not defined and has been known to not trigger failures under some compilers. Default instead to using assert(), which has the added benefit of printing a descriptive message and it is also likely more portable as it is part of ANSI C.
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Simplify PCRE2_ASSERT() and while at it remove no longer needed dependency on __builtin_expect()
Fixes: #484