Add _v4 suffix to (set_)freebind

To match the other IPv4 only socket methods.

Author: Thomasdezeeuw

src/sys/unix.rs

@@ -2167,7 +2167,7 @@ impl crate::Socket {
         feature = "all",
         any(target_os = "android", target_os = "fuchsia", target_os = "linux")
     ))]
-    pub fn freebind(&self) -> io::Result<bool> {
+    pub fn freebind_v4(&self) -> io::Result<bool> {
         unsafe {
             getsockopt::<c_int>(self.as_raw(), libc::SOL_IP, libc::IP_FREEBIND)
                 .map(|freebind| freebind != 0)
@@ -2185,7 +2185,7 @@ impl crate::Socket {
         feature = "all",
         any(target_os = "android", target_os = "fuchsia", target_os = "linux")
     ))]
-    pub fn set_freebind(&self, freebind: bool) -> io::Result<()> {
+    pub fn set_freebind_v4(&self, freebind: bool) -> io::Result<()> {
         unsafe {
             setsockopt(
                 self.as_raw(),