assert does not show output in cygwin test build

[Biswapriyo Nath]

* mintty version: mintty 3.0.6 (x86_64-pc-cygwin)
* cygwin version: 3.1.0-0.6
* code:

#include <assert.h>

int main() {
  int x = 1;
  assert(x == 0);
}

* Expected result: The terminal should show this message which appers
in latest stable cygwin version.
assertion "x == 0" failed: file "test.c", line 6, function: main

* Actual result: terminal only shows "Aborted (core dumped)".

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