*: add "noexcept" to many, many function prototypes

This eliminates some overhead, because the compiler doesn't need to
consider these functions throwing.

src/net/AllocatedSocketAddress.cxx

@@ -50,7 +50,7 @@ AllocatedSocketAddress::operator=(SocketAddress src)
 }
 
 void
-AllocatedSocketAddress::SetSize(size_type new_size)
+AllocatedSocketAddress::SetSize(size_type new_size) noexcept
 {
 	if (size == new_size)
 		return;
@@ -63,7 +63,7 @@ AllocatedSocketAddress::SetSize(size_type new_size)
 #ifdef HAVE_UN
 
 void
-AllocatedSocketAddress::SetLocal(const char *path)
+AllocatedSocketAddress::SetLocal(const char *path) noexcept
 {
 	const bool is_abstract = *path == '@';