fix socket.h on mips

why does mips have to be gratuitously incompatible in every possible
imaginable way?

arch/mips/bits/socket.h

@@ -15,3 +15,6 @@ struct cmsghdr
 	int cmsg_level;
 	int cmsg_type;
 };
+
+#define SOCK_STREAM    2
+#define SOCK_DGRAM     1

include/sys/socket.h

@@ -34,8 +34,11 @@ struct linger
 #define SHUT_WD 1
 #define SHUT_RDWR 2
 
+#ifndef SOCK_STREAM
 #define SOCK_STREAM    1
 #define SOCK_DGRAM     2
+#endif
+
 #define SOCK_RAW       3
 #define SOCK_RDM       4
 #define SOCK_SEQPACKET 5