Replaced the funky and hard-to-compile ACK malloc with a much smaller

and simpler one stolen from K&R. libc builds now.

lang/cem/libcc.ansi/malloc/realloc.c

@@ -0,0 +1,41 @@
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <string.h>
+#include "malloc.h"
+
+void* realloc(void *ptr, size_t size)
+{
+	block_t* h;
+	size_t nblocks;
+	void* newptr;
+
+	if (size == 0)
+	{
+		free(ptr);
+		return NULL;
+	}
+
+	if (!ptr)
+		return malloc(size);
+
+	h = BLOCKOF(ptr);
+
+	nblocks = BLOCKCOUNT(size);
+	/* Overflow check. */
+	if (nblocks < size)
+		return NULL;
+	
+	/* Shrinking the block? Don't bother doing anything (it's never worth it). */
+	if (nblocks <= h->size)
+		return ptr;
+
+	/* Allocate and copy. */
+
+	newptr = malloc(size);
+	if (!newptr)
+		return NULL;
+	memcpy(newptr, ptr, h->size * sizeof(block_t));
+	free(ptr);
+	return newptr;
+}