Fix filelib:wildcard/1,2 for patterns containing ".." and/or "@"

`..` was broken and only worked when it was used in the beginning
of the pattern before any wildcard characters. For example:

    1> filelib:wildcard("erts/..").
    ["erts/.."]

Using `..` preceded by wildcard characters would not work:

    1> filelib:wildcard("*/..").
    []

`@` is not a wildcard character but is used internally in `filelib` as
an escape character and was not handled as other literal
characters. That could lead to performance degradation as it disabled
an optimization of the matching of the literal prefix of a pattern. It
would also cause the following example to fail:

    1> filelib:wildcard("@/..").
    []

This commit corrects the handling `..` and also makes sure that the
use of `@` in a pattern does not degrade performance.

https://bugs.erlang.org/browse/ERL-1029

* legoscia/stdlib/fun2ms-plusplus/OTP-15992/PR-2322:
  fun2ms: accept ++ in function head when called from shell

ErlSubBin is a large struct that often dwarfs the region of memory
it points at, and it's common for them to refer to a ProcBin which
must be kept around as long as the SubBin lives, using up even more
heap space and keeping the referenced binary alive regardless of
how small the sub-binary is.

Code such as ets:fun2ms(fun({"foo" ++ X}) -> X end) works fine in
compiled code.  Let's make it work when fun2ms is invoked from the
shell as well.

* rickard/pcre-8.43/OTP-15889:
  Updated stdlib runtime dependency to erts
  Convert generated re replace and split tests from latin1 to UTF8
  Adjust generated re replacement and split tests
  Generate new re replacement and split tests using perl 5.22.1
  Update internal PCRE to version 8.43

* john/erts/lists_subtract_fixes/OTP-15938/OTP-15939:
  erts: Fix integer overflow in loader
  erts: Fix integer overflow in list subtraction

CMP_TERM returned an `Sint`, which overflowed the `int` used in
erl_rbtree for storing the comparison, causing list subtraction to
behave strangely.

Adjustment needed due to incompatibility between PCRE 8.43
and perl version 5.22.1