Use <dirent.h> instead of <sys/dir.h>

Using <dirent.h> and struct dirent instead of <sys/dir.h> and struct direct
is preferred and works on Android which lacks sys/dir.h.

See:
http://pubs.opengroup.org/onlinepubs/009695399/basedefs/dirent.h.html

proc/sysinfo.c

@@ -399,7 +399,7 @@ static void crash(const char *filename) {
 /***********************************************************************/
 
 static void getrunners(unsigned int *restrict running, unsigned int *restrict blocked) {
-  struct direct *ent;
+  struct dirent *ent;
   DIR *proc;
 
   *running=0;