Flush stdout when needed

[kabiroberai]

This fixes a bug on certain machines (eg the iSH emulator on iOS), where the output of commands and/or the prompt wouldn't be printed correctly.

Before:

Kabirs-iPhone:~# mcrcon -H <HOST> -p <PASS>
Logged in. Type 'quit' or 'exit' to quit.
say hi
list
>>There are 0 of a max 20 players online: 
^C>Kabirs-iPhone:~#

After:

Kabirs-iPhone:~# mcrcon -H <HOST> -p <PASS>
Logged in. Type 'quit' or 'exit' to quit.
>say hi
>list
There are 0 of a max 20 players online: 
>^CKabirs-iPhone:~# 

[sludin]

Another option is the add the following:

setvbuf( stdout, NULL, _IONBF, 0 );

To the start of main. I personally have only hit this on windows (mingw) so guarded it as such, but it sounds like the buffering may be a larger problem/inconsistency.

[Tiiffi]

@sludin

Another option is the add the following:

setvbuf( stdout, NULL, _IONBF, 0 );

I think this is the best solution. I will add it to the next release after some testing.