add truncate64 on linux
diff --git a/src/unix/notbsd/mod.rs b/src/unix/notbsd/mod.rs
index 3f646f1..c7b714b 100644
--- a/src/unix/notbsd/mod.rs
+++ b/src/unix/notbsd/mod.rs
@@ -925,6 +925,7 @@
result: *mut *mut ::dirent64) -> ::c_int;
pub fn setrlimit64(resource: ::c_int, rlim: *const rlimit64) -> ::c_int;
pub fn stat64(path: *const c_char, buf: *mut stat64) -> ::c_int;
+ pub fn truncate64(path: *const c_char, length: off64_t) -> ::c_int;
pub fn eventfd(init: ::c_uint, flags: ::c_int) -> ::c_int;
pub fn sysinfo (info: *mut ::sysinfo) -> ::c_int;