Removed polyfill implementation and updated struct and constants required (+2 squashed commit)

Squashed commit:

[7aeabc9] Fixed style issues

[a393299] Implemented flock for vxworks using ioctl

Author: Jesse Hoogervorst

src/vxworks/mod.rs

@@ -412,6 +412,15 @@ s! {
         pub mq_flags:   ::c_long,
         pub mq_curmsgs: ::c_long,
     }
+
+    pub struct flock {
+        pub l_type: ::c_short,
+        pub l_whence: ::c_short,
+        pub l_start: ::c_long,
+        pub l_len: ::c_long,
+        pub l_pid: ::c_short,
+        pub l_xxx: ::c_short,
+    }
 }
 
 s_no_extra_traits! {
@@ -943,6 +952,9 @@ pub const F_GETLK: ::c_int = 7;
 pub const F_SETLK: ::c_int = 8;
 pub const F_SETLKW: ::c_int = 9;
 pub const F_DUPFD_CLOEXEC: ::c_int = 14;
+pub const F_RDLCK: ::c_int = 1;
+pub const F_WRLCK: ::c_int = 2;
+pub const F_UNLCK: ::c_int = 3;
 
 // signal.h
 pub const SIG_DFL: sighandler_t = 0 as sighandler_t;