haiku: fix incorrect constant for EMFILE.

Author: jessicah

src/unix/haiku/mod.rs

@@ -542,7 +542,7 @@ pub const EISDIR : ::c_int = -2147459063;
 pub const ENOTEMPTY : ::c_int = -2147459066;
 pub const ENOSPC : ::c_int = -2147459065;
 pub const EROFS : ::c_int = -2147459064;
-pub const EMFILE : ::c_int = -214745962;
+pub const EMFILE : ::c_int = -2147459062;
 pub const EXDEV : ::c_int = -2147459061;
 pub const ELOOP : ::c_int = -2147459060;
 pub const ENOEXEC : ::c_int = -2147478782;