Remove preprocessor guards by OS. Project should now only include the needed files.

setter/src/dos/frag.c

@@ -27,8 +27,6 @@ Contains DOS code
 Copyright (C) 2011-2021 Natalia Portillo
 *****************************************************************************/
 
-#if defined(__DOS__) || defined(MSDOS)
-
 #include <dos.h>
 #include <io.h>
 #include <stdio.h>
@@ -252,5 +250,3 @@ void Fragmentation(const char* path, size_t clusterSize)
            wRc,
            cRc);
 }
-
-#endif