remove unneeded linker args to make it work on stable

examples/helloworld/README.md

@@ -2,7 +2,7 @@
 
 ## Usage
 
-- build with `cargo +nightly build`
+- build with `cargo build`
 - run php with the module and call the defined method 
   ```bash
   php -d extension=target/debug/libhelloworld.so -r 'helloworld();'`

examples/helloworld/src/lib.rs

@@ -1,5 +1,4 @@
 #![allow(unused_variables)]
-#![feature(link_args)]
 
 extern crate libc;
 extern crate php;
@@ -9,7 +8,6 @@ use php::*;
 use zend::*;
 use php::info::*;
 
-#[link_args = "-Wl,-undefined,dynamic_lookup"]
 extern {
     pub fn php_printf(format: *const c_char , ...) -> size_t;
 }

src/info.rs

@@ -1,7 +1,6 @@
 use libc::*;
 use std::ffi::CString;
 
-#[link_args = "-Wl,-undefined,dynamic_lookup"]
 extern {
     pub fn php_info_print_table_start();
     pub fn php_info_print_table_row(num_cols: c_int, ...) -> c_void;

src/lib.rs

@@ -1,6 +1,5 @@
 #![allow(dead_code)]
 #![allow(unused_variables)]
-#![feature(link_args)]
 
 
 extern crate libc;