QA build, only for testing

PHP version 7.3.12RC1 (07 Nov 2019)

Core:

• Fixed bug #78658 (Memory corruption using Closure::bindTo). (Nikita)
• Fixed bug #78656 (Parse errors classified as highest log-level). (Erik Lundin)
• Fixed bug #78752 (Segfault if GC triggered while generator stack frame is being destroyed). (Nikita)
• Fixed bug #78689 (Closure::fromCallable() doesn't handle [Closure, '__invoke']). (Nikita)

Date:

• Fixed bug #70153 (\DateInterval incorrectly unserialized). (Maksim Iakunin)
• Fixed bug #78751 (Serialising DatePeriod converts DateTimeImmutable). (cmb)

Iconv:

• Fixed bug #78642 (Wrong libiconv version displayed). (gedas at martynas, cmb).

OpCache:

• Fixed bug #78654 (Incorrectly computed opcache checksum on files with non-ascii characters). (mhagstrand)
• Fixed bug #78747 (OpCache corrupts custom extension result). (Nikita)

OpenSSL:

• Fixed bug #78775 (TLS issues from HTTP request affecting other encrypted connections). (Nikita)

Reflection:

• Fixed bug #78697 (ReflectionClass::ImplementsInterface - inaccurate error message with traits). (villfa)

Sockets:

• Fixed bug #78665 (Multicasting may leak memory). (cmb)