net/StaticSocketAddress: make the cast operators `constexpr`

src/net/StaticSocketAddress.hxx

@@ -54,17 +54,16 @@ public:
 
 	StaticSocketAddress &operator=(SocketAddress other) noexcept;
 
-	operator SocketAddress() const noexcept {
-		return SocketAddress(reinterpret_cast<const struct sockaddr *>(&address),
-				     size);
+	constexpr operator SocketAddress() const noexcept {
+		return SocketAddress(*this, size);
 	}
 
-	operator struct sockaddr *() noexcept {
-		return reinterpret_cast<struct sockaddr *>(&address);
+	constexpr operator struct sockaddr *() noexcept {
+		return (struct sockaddr *)(void *)&address;
 	}
 
-	operator const struct sockaddr *() const noexcept {
-		return reinterpret_cast<const struct sockaddr *>(&address);
+	constexpr operator const struct sockaddr *() const noexcept {
+		return (const struct sockaddr *)(const void *)&address;
 	}
 
 	constexpr size_type GetCapacity() const noexcept {