lang/php81: Update version 8.1.5=>8.1.6
* Core:
Fixed bug #8310 (Registry settings are no longer recognized).
Fixed potential race condition during resource ID allocation.
Fixed bug #8133 (Preloading of constants containing arrays with enums
segfaults).
Fixed Haiku ZTS builds.
* Date:
Fixed bug #7752 (DateTimeZone::getTransitions() returns insufficient
data).
Fixed bug #8108 (Timezone doesn't work as intended).
Fixed bug #81660 (DateTimeZone::getTransitions() returns invalid data)
Fixed bug #8289 (Exceptions thrown within a yielded from iterator are
not rethrown into the generator).
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Add php81 to the tree
Core:
Fixed inclusion order for phpize builds on Windows.
Added missing hashtable insertion APIs for arr/obj/ref.
Implemented FR #77372 (Relative file path is removed from uploaded
file).
Fixed bug #81607 (CE_CACHE allocation with concurrent access).
Fixed bug #81507 (Fiber does not compile on AIX).
Fixed bug #78647 (SEGFAULT in zend_do_perform_implementation_check).
Fixed bug #81518 (Header injection via default_mimetype / default_charset).
Fixed bug #75941 (Fix compile failure on Solaris with clang).
Fixed bug #81380 (Observer may not be initialized properly).
Fixed bug #81514 (Using Enum as key in WeakMap triggers GC + SegFault).
Fixed bug #81520 (TEST_PHP_CGI_EXECUTABLE badly set in run-tests.php).
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