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.