getAvailableDiskSpace now works on FreeBSD

Author: jercaianu

changelog/std-file-getAvailableDiskSpace.dd

@@ -4,8 +4,6 @@ $(REF getAvailableDiskSpace, std,file) receives as a parameter the path of a fil
 directory in the file system, and returns the available disk space on the mounted filesystem.
 If the given path is nonexistent, an exception is thrown.
 
-Due to inconsistent behaviour with the `statvfs` `Posix` function, FreeBSD does not support this functionality.
-
 ---
 import std.file;
 ulong size = getAvailableDiskSpace(".");