Try replacing anonymous struct by a placeholder

This way alignment remains right.
It should work as long as clients
do not try to access obfuscated fields.

src/unix/linux_like/linux/musl/b32/x86/mod.rs

@@ -3,11 +3,6 @@ pub type wchar_t = i32;
 pub type greg_t = i32;
 
 s! {
-    pub struct _libc_fpreg {
-        pub significand: [u16; 4],
-        pub exponent: u16,
-    }
-
     pub struct stat {
         pub st_dev: ::dev_t,
         __st_dev_padding: ::c_int,
@@ -118,11 +113,6 @@ s! {
         pub f_spare: [::c_ulong; 4],
     }
 
-    pub struct _fpreg {
-        pub significand: [u16; 4],
-        pub exponent: u16,
-    }
-
     pub struct _fpstate {
         pub cw: ::c_ulong,
         pub sw: ::c_ulong,
@@ -131,7 +121,7 @@ s! {
         pub cssel: ::c_ulong,
         pub dataoff: ::c_ulong,
         pub datasel: ::c_ulong,
-        pub _st: [_libc_fpreg; 8],
+        pub _st: [u16; 40], // anonymous struct replaced by a placeholder
         pub status: ::c_ulong,
     }