Move api module into platform::linux

src/platform/linux/dlopen.rs

@@ -0,0 +1,15 @@
+#![cfg(any(target_os = "linux", target_os = "dragonfly", target_os = "freebsd", target_os = "openbsd"))]
+#![allow(dead_code)]
+
+use std::os::raw::{c_void, c_char, c_int};
+
+pub const RTLD_LAZY: c_int = 0x001;
+pub const RTLD_NOW: c_int = 0x002;
+
+#[link="dl"]
+extern {
+    pub fn dlopen(filename: *const c_char, flag: c_int) -> *mut c_void;
+    pub fn dlerror() -> *mut c_char;
+    pub fn dlsym(handle: *mut c_void, symbol: *const c_char) -> *mut c_void;
+    pub fn dlclose(handle: *mut c_void) -> c_int;
+}