Merge pull request rust-lang#95 from dimbleby/path-max

Add PATH_MAX

Author: alexcrichton

src/unix/notbsd/mod.rs

@@ -338,6 +338,8 @@ pub const SA_RESETHAND: ::c_int = 0x80000000;
 pub const SA_RESTART: ::c_int = 0x10000000;
 pub const SA_NOCLDSTOP: ::c_int = 0x00000001;
 
+pub const PATH_MAX: ::c_int = 4096;
+
 pub const FD_SETSIZE: usize = 1024;
 
 f! {