[PATCH] Include malloc.h in libc/stdlib/aligned_alloc.c

Ok to commit?

Noticed by build-scripts diffing warnings at build-time,
that noticed a regression with my "import" of yesterday's
newlib, compared to the previous newlib from May 2019,
i.e. before the "Reimplement aligned_alloc" rewrite.

Without this, for a bare-iron/simulator target such as cris-elf,
you'll see, at newlib build time:

/x/gccobj/./gcc/xgcc -B/x/gccobj/./gcc/ <many options elided> -c -o lib_a-aligned_alloc.o \
 `test -f 'aligned_alloc.c' || echo '/y/newlib/libc/stdlib/'`aligned_alloc.c
/y/newlib/libc/stdlib/aligned_alloc.c: In function 'aligned_alloc':
/y/newlib/libc/stdlib/aligned_alloc.c:35:10: warning: implicit declaration of function \
 '_memalign_r' [-Wimplicit-function-declaration]
   35 |   return _memalign_r (_REENT, align, size);
      |          ^~~~~~~~~~~
---
 newlib/libc/stdlib/aligned_alloc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/newlib/libc/stdlib/aligned_alloc.c b/newlib/libc/stdlib/aligned_alloc.c
index feb22c24b947..06b3883cfb00 100644
--- a/newlib/libc/stdlib/aligned_alloc.c
+++ b/newlib/libc/stdlib/aligned_alloc.c
@@ -28,6 +28,7 @@
 
 #include <reent.h>
 #include <stdlib.h>
+#include <malloc.h>
 
 void *
 aligned_alloc (size_t align, size_t size)
-- 
2.11.0

brgds, H-P