Fix rip and rdp types in user_fpregs_struct

Author: loganwendholt

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

@@ -122,8 +122,8 @@ s_no_extra_traits!{
         pub swd: ::c_ushort,
         pub ftw: ::c_ushort,
         pub fop: ::c_ushort,
-        pub rip: ::c_ulonglong,
-        pub rdp: ::c_ulonglong,
+        pub rip: ::c_ulong,
+        pub rdp: ::c_ulong,
         pub mxcsr: ::c_uint,
         pub mxcr_mask: ::c_uint,
         pub st_space: [::c_uint; 32],