configure: remove unused file

Remove the dummy and unused configure file. Glancing across distributions (Alpine, Arch,
Fedora, CentOS Stream, Gentoo, Debian, Ubuntu) - they don't use it.

It's not mentioned in our README either, so let's just remove it.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

check_whence.py

@@ -84,7 +84,6 @@ def main():
             "WHENCE",
             "build_packages.py",
             "check_whence.py",
-            "configure",
             "contrib/process_linux_firmware.py",
             "contrib/templates/debian.changelog",
             "contrib/templates/debian.control",

configure

@@ -1,4 +0,0 @@
-#!/bin/bash
-# -*- mode: sh -*-
-# Our Makefile doesn't do srcdir != builddir
-#buildapi-variable-no-builddir