Add sockaddr_vm definition for Fuchsia

Author: jamesr

libc-test/semver/fuchsia.txt

@@ -1446,6 +1446,7 @@ sigwait
 sigwaitinfo
 sockaddr_ll
 sockaddr_nl
+sockaddr_vm
 splice
 spwd
 srand

src/fuchsia/mod.rs

@@ -359,9 +359,10 @@ s! {
 
     pub struct sockaddr_vm {
         pub svm_family: sa_family_t,
-        pub svm_reserved: u16,
+
+        pub svm_reserved: c_ushort,
         pub svm_port: crate::in_port_t,
-        pub svm_cid: u32,
+        pub svm_cid: c_uint,
         pub svm_zero: [u8; 4],
     }