Update x86_64 to musl 1.2.3

Author: wesleywiser

src/unix/linux_like/linux/musl/b64/x86_64/mod.rs

@@ -653,7 +653,7 @@ pub const MAP_32BIT: ::c_int = 0x0040;
 pub const O_APPEND: ::c_int = 1024;
 pub const O_DIRECT: ::c_int = 0x4000;
 pub const O_DIRECTORY: ::c_int = 0x10000;
-pub const O_LARGEFILE: ::c_int = 0;
+pub const O_LARGEFILE: ::c_int = 0x8000;
 pub const O_NOFOLLOW: ::c_int = 0x20000;
 pub const O_CREAT: ::c_int = 64;
 pub const O_EXCL: ::c_int = 128;