Remove left behind commented #includes from fat16.cc

According to the GIT history the lines were added by this commit:
    8d808c0b62
    gparted-0.3.6 - code recreation from Source Forge

Looking at the SVN history this commit actually fleshed out the
implementations of fat16::get_label() and fat32::get_label() and added
the commented #includes:
    https://sourceforge.net/p/gparted/svn/118
    Added read label support for fat16 and fat32 using mtools mlabel command
    2008-02-12

Then this SVN commit moved the mtools temporary file handling code into
Utils.cc, leaving behind the commented #includes:
    https://sourceforge.net/p/gparted/svn/124
    Added MTools temporary file handling functions
    2008-02-19

Finally this commit removed fat32.cc by merging the code with fat16.cc:
    519af1a7c0
    Combine duplicate code for fat16/32

So remove the left behind commented #includes from fat16.cc.

src/fat16.cc

@@ -22,12 +22,6 @@
 #include <glibmm/miscutils.h>
 #include <glibmm/shell.h>
 
-/*****
-//For some reason unknown, this works without these include statements.
-#include <stdlib.h>    // 'C' library for mkstemp()
-#include <unistd.h>    // 'C' library for write(), close()
-#include <stdio.h>     // 'C' library for remove()
-*****/
 
 namespace GParted
 {