Committed, libgloss: hook up cris-elf to the initfini-array support.

After a binutils change "a while ago" (2015-12) to default to
--enable-initfini-array, i.e. to merge .ctors and .dtors into
.init_array and .fini_array, this is needed for cdtors to run at all.

Based on what goes on in arm/ and aarch64/.  Tested for cris-elf by
running the gcc testsuite.

By the way, the configure test doesn't detect this change, so the
HAVE_INITFINI_ARRAY ifdeffery is somewhat redundant.  Still, the
change is tested to be safe with older binutils too.

libgloss/
	* cris/crt0.S, cris/lcrt0.c: Include newlib.h.
	[HAVE_INITFINI_ARRAY] (_init): Define to __libc_init_array.
	[HAVE_INITFINI_ARRAY] (_fini): Ditto __libc_fini_array.

libgloss/cris/crt0.S

@@ -1,5 +1,5 @@
 /* Generic simplistic start-up-stub for CRIS/CRISv32.
-   Copyright (C) 1993-2005, 2007 Axis Communications.
+   Copyright (C) 1993-2005, 2007, 2017 Axis Communications.
    All rights reserved.
 
    Redistribution and use in source and binary forms, with or without
@@ -26,6 +26,8 @@
    IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.  */
 
+#include "newlib.h"
+
 #undef cris
 #undef L
 #ifdef __NO_UNDERSCORES__
@@ -34,6 +36,11 @@
 #define L(x) _ ## x
 #endif
 
+#ifdef HAVE_INITFINI_ARRAY
+#define _init __libc_init_array
+#define _fini __libc_fini_array
+#endif
+
 ; Rudimentary v0..v32-compatible startup stub.
 
 #ifdef __ELF__

libgloss/cris/lcrt0.c

@@ -1,5 +1,5 @@
 /* Support for cris*-axis-linux-gnu and src/sim/cris simulator.
-   Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 Axis Communications.
+   Copyright (C) 2000-2005, 2017 Axis Communications.
    All rights reserved.
 
    Redistribution and use in source and binary forms, with or without
@@ -27,6 +27,12 @@
    POSSIBILITY OF SUCH DAMAGE.  */
 
 #include "linunistd.h"
+#include "newlib.h"
+
+#ifdef HAVE_INITFINI_ARRAY
+#define _init __libc_init_array
+#define _fini __libc_fini_array
+#endif
 
 extern void exit (int) __attribute ((__noreturn__));