Revert previous commit, restoring the memcpy() call.

The reported issue was due to an error in their test code, not in
inflate. This use of memcpy() in inflate is correct.

inflate.c

@@ -884,12 +884,12 @@ int ZEXPORT inflate(z_streamp strm, int flush) {
                 if (copy > have) copy = have;
                 if (copy > left) copy = left;
                 if (copy == 0) goto inf_leave;
+                zmemcpy(put, next, copy);
                 have -= copy;
+                next += copy;
                 left -= copy;
+                put += copy;
                 state->length -= copy;
-                do {
-                    *put++ = *next++;
-                } while (--copy);
                 break;
             }
             Tracev((stderr, "inflate:       stored end\n"));