proxy" (http://curl.haxx.se/bug/view.cgi?id=2107377) that showed how a multi
  interface using program didn't work when built with GnuTLS and a CONNECT
  request was done over a proxy (basically test 502 over a proxy to a HTTPS
  site). It turned out the ssl connect function would get called twice which
  caused the second call to fail.

  Disable remark #279: controlling expression is constant

      Remark triggered mostly on va_arg() and FD_ZERO() macros.

that memdebug.h is included in the test programs.

check for winsock build target configurations

and HAVE_STRNCASECMP.

  Disable remark #981: operands are evaluated in unspecified order

      Function calls which are triggering this remark, today, do not depend
      on the order of evaluation of its arguments.

  Disable remark #1469: "cc" clobber ignored

      Remark triggered on htons() and ntohs() due to glibc header files.

Also, leave the existing SIGALRM handler alone if the timeout is too small
to handle.

error message.

we select ANSI C89 dialect plus GNU extensions.