Add some missing includes to kill warnings when building with the default

Config.h and using gcc's -fno-builtin.  There are probably other files
with the similar problems.
Also, if building against uClibc, don't include asm/unistd.h in syscalls.c
and module_syscalls.c.

archival/libunarchive/decompress_unzip.c

@@ -64,6 +64,7 @@ static char *license_msg[] = {
 #include <sys/wait.h>
 #include <signal.h>
 #include <stdlib.h>
+#include <string.h>
 #include "libbb.h"
 
 FILE *in_file, *out_file;

archival/libunarchive/unzip.c

@@ -64,6 +64,7 @@ static char *license_msg[] = {
 #include <sys/wait.h>
 #include <signal.h>
 #include <stdlib.h>
+#include <string.h>
 #include "libbb.h"
 
 FILE *in_file, *out_file;

coreutils/rm.c

@@ -29,6 +29,7 @@
 #include <errno.h>
 #include <unistd.h>
 #include <stdlib.h>
+#include <string.h>
 #include <getopt.h>
 #include "busybox.h"
 

libbb/concat_path_file.c

@@ -6,6 +6,7 @@
  *
 */
 
+#include <string.h>
 #include "libbb.h"
 
 extern char *concat_path_file(const char *path, const char *filename)

libbb/copy_file.c

@@ -29,6 +29,7 @@
 #include <errno.h>
 #include <dirent.h>
 #include <stdlib.h>
+#include <string.h>
 
 #include "libbb.h"
 

libbb/dirname.c

@@ -19,6 +19,7 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */
 
+#include <string.h>
 #include "libbb.h"
 
 /* Return a string on the heap containing the directory component of PATH.  */

libbb/last_char_is.c

@@ -19,6 +19,7 @@
  *
  */
 
+#include <string.h>
 #include "libbb.h"
 
 /* Find out if the last character of a string matches the one given Don't

libbb/module_syscalls.c

@@ -28,7 +28,9 @@
    _syscall* defined.  */
 #define __LIBRARY__
 #include <sys/syscall.h>
+#ifndef __UCLIBC__
 #include <asm/unistd.h>
+#endif
 #include "libbb.h"
 
 

libbb/remove_file.c

@@ -29,6 +29,7 @@
 #include <errno.h>
 #include <unistd.h>
 #include <stdlib.h>
+#include <string.h>
 #include <getopt.h>
 #include "libbb.h"
 

libbb/syscalls.c

@@ -30,7 +30,9 @@
 
 
 #include <sys/syscall.h>
+#ifndef __UCLIBC__
 #include <asm/unistd.h>
+#endif
 #include "libbb.h"
 
 #if defined(__ia64__)

libbb/unzip.c

@@ -64,6 +64,7 @@ static char *license_msg[] = {
 #include <sys/wait.h>
 #include <signal.h>
 #include <stdlib.h>
+#include <string.h>
 #include "libbb.h"
 
 FILE *in_file, *out_file;

rm.c

@@ -29,6 +29,7 @@
 #include <errno.h>
 #include <unistd.h>
 #include <stdlib.h>
+#include <string.h>
 #include <getopt.h>
 #include "busybox.h"