Include missing <string.h> and <limits.h>

Fix warnings.

Update #2132.
Update #2133.

rtemsbsd/rtems/rtems-kernel-init.c

@@ -51,6 +51,8 @@
 #include <sys/stat.h>
 #include <sys/kbio.h>
 
+#include <limits.h>
+
 #include <dev/kbd/kbdreg.h>
 
 #include <net80211/ieee80211_freebsd.h>