Add clang-format file

Also run it across the whole tree to get everything using the One True Style.
We don't yet run this in an automated fashion as it's a little slow, but
there is a snippet to do so in makeall.sh.

LibC/netdb.h

@@ -14,7 +14,7 @@ struct hostent {
 #define h_addr h_addr_list[0]
 };
 
-struct hostent *gethostbyname(const char*);
+struct hostent* gethostbyname(const char*);
 
 struct servent {
     char* s_name;