Fix newlib H8/300 bits for C99/gcc-14

[Jeff Law]

Similar to other patches.  This adds a missing prototype and #include to 
some H8/300 specific code in newlib.

Pushed to the trunk given Jeff J's pre-approval for these kinds of changes.

Jeff L.
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commit dc7ee581321c4023f9ffe0c9f609071354ba1512
Author: Jeff Law <jeffreyalaw@gmail.com>
Date:   Fri Dec 22 20:25:10 2023 -0700

    Fix newlib H8/300 bits for C99/gcc-14
    
    Similar to other patches.  This adds a missing prototype and #include to some
    H8/300 specific code in newlib.  Pushed to the trunk given Jeff J's
    pre-approval for these kinds of changes.

diff --git a/newlib/libc/sys/h8300hms/sbrk.c b/newlib/libc/sys/h8300hms/sbrk.c
index 1456a67eb..a99ae2904 100644
--- a/newlib/libc/sys/h8300hms/sbrk.c
+++ b/newlib/libc/sys/h8300hms/sbrk.c
@@ -1,8 +1,10 @@
 #include <_ansi.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <stdlib.h>
 
 register char *stack_ptr asm ("sp");
+extern int _write (int, char *, int);
 
 caddr_t 
   _sbrk(incr)