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
diff --git a/procps/free.c b/procps/free.c
index f2e746e..4dd99ab 100644
--- a/procps/free.c
+++ b/procps/free.c
@@ -24,6 +24,7 @@
 #include "busybox.h"
 #include <stdio.h>
 #include <errno.h>
+#include <stdlib.h>
 
 extern int free_main(int argc, char **argv)
 {
diff --git a/procps/kill.c b/procps/kill.c
index 19ca187..3eb829a 100644
--- a/procps/kill.c
+++ b/procps/kill.c
@@ -28,6 +28,7 @@
 #include <unistd.h>
 #include <signal.h>
 #include <ctype.h>
+#include <string.h>
 #include <unistd.h>
 
 static const int KILL = 0;
diff --git a/procps/ps.c b/procps/ps.c
index cb4c21e..aac064c 100644
--- a/procps/ps.c
+++ b/procps/ps.c
@@ -30,11 +30,13 @@
 
 #include "busybox.h"
 #include <stdio.h>
+#include <stdlib.h>
 #include <unistd.h>
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <ctype.h>
+#include <string.h>
 #include <sys/ioctl.h>
 #define BB_DECLARE_EXTERN
 #define bb_need_help
diff --git a/procps/renice.c b/procps/renice.c
index 8f06181..9d85ba0 100644
--- a/procps/renice.c
+++ b/procps/renice.c
@@ -23,6 +23,7 @@
 #include "busybox.h"
 #include <stdio.h>
 #include <errno.h>
+#include <stdlib.h>
 #include <sys/time.h>
 #include <sys/resource.h>
 
diff --git a/procps/uptime.c b/procps/uptime.c
index b827f7e..4463b94 100644
--- a/procps/uptime.c
+++ b/procps/uptime.c
@@ -32,6 +32,7 @@
 #include <stdio.h>
 #include <time.h>
 #include <errno.h>
+#include <stdlib.h>
 
 static const int FSHIFT = 16;              /* nr of bits of precision */
 #define FIXED_1         (1<<FSHIFT)     /* 1.0 as fixed-point */