Fix libbacktrace bootstrap with gcc 4.4

* fileline.c: Include <stdlib.h>.
	* mmap.c: Likewise.

From-SVN: r191414

libbacktrace/ChangeLog

@@ -1,3 +1,8 @@
+2012-09-18  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	* fileline.c: Include <stdlib.h>.
+	* mmap.c: Likewise.
+
 2012-09-17  Ian Lance Taylor  <iant@google.com>
 
 	PR bootstrap/54611

libbacktrace/fileline.c

@@ -35,6 +35,7 @@ POSSIBILITY OF SUCH DAMAGE.  */
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
+#include <stdlib.h>
 
 #include "backtrace.h"
 #include "internal.h"

libbacktrace/mmap.c

@@ -34,6 +34,7 @@ POSSIBILITY OF SUCH DAMAGE.  */
 
 #include <errno.h>
 #include <string.h>
+#include <stdlib.h>
 #include <unistd.h>
 #include <sys/mman.h>