make brace placement in public header struct definitions consistent

placing the opening brace on the same line as the struct keyword/tag
is the style I prefer and seems to be the prevailing practice in more
recent additions.

these changes were generated by the command:

find include/ arch/*/bits -name '*.h' \
-exec sed -i '/^struct [^;{]*$/{N;s/\n/ /;}' {} +

and subsequently checked by hand to ensure that the regex did not pick
up any false positives.

include/netdb.h

@@ -13,8 +13,7 @@ extern "C" {
 #include <bits/alltypes.h>
 #endif
 
-struct addrinfo
-{
+struct addrinfo {
 	int ai_flags;
 	int ai_family;
 	int ai_socktype;
@@ -62,16 +61,14 @@ const char *gai_strerror(int);
 
 /* Legacy functions follow (marked OBsolete in SUS) */
 
-struct netent
-{
+struct netent {
 	char *n_name;
 	char **n_aliases;
 	int n_addrtype;
 	uint32_t n_net;
 };
 
-struct hostent
-{
+struct hostent {
 	char *h_name;
 	char **h_aliases;
 	int h_addrtype;
@@ -80,16 +77,14 @@ struct hostent
 };
 #define h_addr h_addr_list[0]
 
-struct servent
-{
+struct servent {
 	char *s_name;
 	char **s_aliases;
 	int s_port;
 	char *s_proto;
 };
 
-struct protoent
-{
+struct protoent {
 	char *p_name;
 	char **p_aliases;
 	int p_proto;