Avoid more compiler warnings.

* libc/stdlib/btowc.c: Add missing header.
* libc/stdlib/getopt.c (getopt_internal): Initialize variable.
* libc/stdlib/system.c (do_system) [__CYGWIN__]: Add declaration.
* libc/stdlib/wctob.c: Add missing header.
* libc/string/strcpy.c (strcpy): Avoid warnings.
* libc/string/strrchr.c (strrchr): Likewise.

1 files changed, 1 insertions, 0 deletions

diff --git a/newlib/libc/stdlib/system.c b/newlib/libc/stdlib/system.c
index ad2217743..0b5d9a149 100644
--- a/newlib/libc/stdlib/system.c
+++ b/newlib/libc/stdlib/system.c
@@ -179,6 +179,7 @@ do_system (ptr, s)
     return -1;
   else
     {
+      extern int _wait (int *);
       int rc = _wait (&status);
       if (rc == -1)
 	return -1;