Fix LP64 architectures and especially ia64. Functions that return

a pointer and lack a prototype will have the return value (assumed
to be an integer) zero-extended to a pointer. On ia64 this is
unconditionally fatal as it zeroes-out the region bits, forming an
invalid pointer. Fix the sigsegv by including <stdlib.h>.

Pointy hat: bbraun

lib/libc/gen/basename.c

@@ -35,6 +35,7 @@ __FBSDID("$FreeBSD$");
 
 #include <errno.h>
 #include <libgen.h>
+#include <stdlib.h>
 #include <string.h>
 #include <sys/param.h>
 

lib/libc/gen/dirname.c

@@ -35,6 +35,7 @@ __FBSDID("$FreeBSD$");
 
 #include <errno.h>
 #include <libgen.h>
+#include <stdlib.h>
 #include <string.h>
 #include <sys/param.h>