[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Add accurate check for console stdio + add associated primitive (#254)

[akgrant43]

Hi Vincent,

After checking out and building VincentBlondeau:addStdoutIsConsolePrimitive I get:

```
~/pharo7/pharo-snap/pharo-vm/opensmalltalk-vm/build.win32x86/pharo.cog.spur/builddbg/vm
$ gdb PharoConsole.exe
GNU gdb (GDB) (Cygwin 7.10.1-1) 7.10.1
Copyright (C) 2015 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-pc-cygwin".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from PharoConsole.exe...done.
(gdb) run --version
Starting program: /home/alistair/pharo7/pharo-snap/pharo-vm/opensmalltalk-vm/build.win32x86/pharo.cog.spur/builddbg/vm/PharoConsole.exe --                                               version
[New Thread 6252.0x16b0]
[New Thread 6252.0x1114]
[New Thread 6252.0x1a68]
[New Thread 6252.0x1d10]

Program received signal SIGSEGV, Segmentation fault.
0x76e1299b in msvcrt!_fileno () from /cygdrive/c/WINDOWS/System32/msvcrt.dll
(gdb) bt
#0  0x76e1299b in msvcrt!_fileno () from /cygdrive/c/WINDOWS/System32/msvcrt.dll
#1  0x00b4b17b in ?? ()
#2  0x00b4b333 in ?? ()
#3  0x00b4c567 in ?? ()
#4  0x00c22a7d in ?? ()
#5  0x00a913e3 in ?? ()
#6  0x74fc9564 in KERNEL32!BaseThreadInitThunk () from /cygdrive/c/WINDOWS/System32/KERNEL32.DLL
#7  0x773529ac in ntdll!EtwProcessPrivateLoggerRequest () from /cygdrive/c/WINDOWS/SYSTEM32/ntdll.dll
#8  0x77352980 in ntdll!EtwProcessPrivateLoggerRequest () from /cygdrive/c/WINDOWS/SYSTEM32/ntdll.dll
#9  0x00000000 in ?? ()
(gdb)
```

Sorry, but I'm out of time for today.  Hopefully I'll get to investigate a bit more over the coming days.

Cheers,
Alistair

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