tcl: updated to 8.6.9
8.6.9:
* (enhance) stop blocking conversion of object to/from class
* (enhance) NR-enable [package require]
* (bug)[9fd5c6] crash in object deletion, test oo-11.5
* (bug)[3c32a3] crash deleting object with class mixed in
* (platform) stop using -lieee, removed from glibc-2.27
***POTENTIAL INCOMPATIBILITY for math programs that embed Tcl***
* (bug)[8e6a9a] bad binary [string match], test string-11.55
* (bug)[1873ea] repair multi-thread std channel init
* (bug)[db36fa] broken bytecode for index values
* (bug) broken compiled [string replace], test string-14.19
* (bug) [string trim*] engine crashed on invalid UTF
* (bug) missing trace in compiled [array set], test var-20.11
* (bug)[46a241] crash in unset array with search, var-13.[23]
* (bug)[27b682] race made [file delete] raise "no such file"
* (bug)[925643] 32/64 cleanup of filesystem DIR operations
* (bug) leaks in TclSetEnv and env cache
* (bug)[3592747] [yieldto] dying namespace, tailcall-14.1
* (bug)[270f78] race in [file mkdir]
* (bug)[3f7af0] [file delete] raised "permission denied"
* (bug)[d051b7] overflow crash in [format]
* revised quoting of [exec] args in generated command line
***POTENTIAL INCOMPATIBILITY***
* HTTP Keep-Alive with pipelined requests
=> http 2.9.0
* (new)[TIP 505] [lreplace] accepts all out of range indices
* (bug) Prevent crash from NULL keyName
=> registry 1.3.3
* (enhance) advance dde version
=> dde 1.4.1
* tzdata updated to Olson's tzdata2018g
* Update tcltest package for Travis support
=> tcltest 2.5.0
* (bug)[35a8f1] overlong string length of some lists
* (bug)[00d04c] Repair [binary encode base64]
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