as: move old overly complex incomplete prototype to new 0LD subdir; start afresh with a minimalistic design and improve it incrementally

as/0LD/emalloc.c

@@ -0,0 +1,20 @@
+/*
+ * emalloc.c
+ */
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "emalloc.h"
+
+void *emalloc(size_t nrbytes)
+{
+    void *p;
+
+    p = malloc(nrbytes);
+    if (!p) {
+	fprintf(stderr, "malloc(%zu) failed: %s\n", nrbytes, strerror(errno));
+	exit(1);
+    }
+    return p;
+}