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

util-linux/dmesg.c

@@ -18,9 +18,11 @@
 #include "busybox.h"
 #include <stdio.h>
 #include <stdlib.h>
+#include <getopt.h>
 
 #if __GNU_LIBRARY__ < 5
-
+#include <sys/syscall.h>
+#include <linux/unistd.h>
 #ifndef __alpha__
 # define __NR_klogctl __NR_syslog
 static inline _syscall3(int, klogctl, int, type, char *, b, int, len);

util-linux/fbset.c

@@ -31,6 +31,7 @@
 #include <fcntl.h>
 #include <errno.h>
 #include <ctype.h>
+#include <string.h>
 #include <sys/ioctl.h>
 
 #define DEFAULTFBDEV  "/dev/fb0"

util-linux/fdflush.c

@@ -25,6 +25,7 @@
 #include <stdio.h>
 #include <sys/ioctl.h>
 #include <fcntl.h>
+#include <stdlib.h>
 
 /* From <linux/fd.h> */
 #define FDFLUSH  _IO(2,0x4b)

util-linux/freeramdisk.c

@@ -27,6 +27,7 @@
 #include <fcntl.h>
 #include <sys/ioctl.h>
 #include <errno.h>
+#include <stdlib.h>
 #include "busybox.h"
 
 

util-linux/more.c

@@ -29,6 +29,7 @@
 #include <stdio.h>
 #include <fcntl.h>
 #include <signal.h>
+#include <stdlib.h>
 #include <sys/ioctl.h>
 #define BB_DECLARE_EXTERN
 #define bb_need_help

util-linux/rdate.c

@@ -31,6 +31,8 @@
 #include <netdb.h>
 #include <stdio.h>
 #include <getopt.h>
+#include <stdlib.h>
+#include <unistd.h>
 
 
 static const int RFC_868_BIAS = 2208988800UL;

util-linux/swaponoff.c

@@ -24,10 +24,13 @@
 
 #include "busybox.h"
 #include <stdio.h>
-#include <sys/mount.h>
 #include <mntent.h>
 #include <dirent.h>
 #include <errno.h>
+#include <stdlib.h>
+#include <sys/mount.h>
+#include <sys/syscall.h>
+#include <linux/unistd.h>
 
 _syscall2(int, swapon, const char *, path, int, flags);
 _syscall1(int, swapoff, const char *, path);

util-linux/umount.c

@@ -26,6 +26,8 @@
 #include <stdio.h>
 #include <mntent.h>
 #include <errno.h>
+#include <string.h>
+#include <stdlib.h>
 
 
 static const int MNT_FORCE = 1;