Fix header file usage -- there were many unnecessary header files included in

busybox.h which slowed compiles.  I left only what was needed and then fixed up
all the apps to include their own header files.  I also fixed naming for pwd.h
and grp.h functions.  Tested to compile and run with libc5, glibc, and uClibc.
 -Erik

sysklogd/logger.c

@@ -27,6 +27,8 @@
 #include <sys/types.h>
 #include <fcntl.h>
 #include <ctype.h>
+#include <string.h>
+#include <stdlib.h>
 
 #if !defined BB_SYSLOGD
 

sysklogd/syslogd.c

@@ -34,6 +34,7 @@
 #include <signal.h>
 #include <stdarg.h>
 #include <time.h>
+#include <string.h>
 #include <unistd.h>
 #include <sys/socket.h>
 #include <sys/types.h>
@@ -41,7 +42,8 @@
 #include <sys/param.h>
 
 #if ! defined __GLIBC__ && ! defined __UCLIBC__
-
+#include <sys/syscall.h>
+#include <linux/unistd.h>
 typedef unsigned int socklen_t;
 
 #ifndef __alpha__