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/sys/times.h

@@ -8,8 +8,7 @@ extern "C" {
 #define __NEED_clock_t
 #include <bits/alltypes.h>
 
-struct tms
-{
+struct tms {
 	clock_t tms_utime;
 	clock_t tms_stime;
 	clock_t tms_cutime;