Overhaul build system and add support for disabling inetd support.

This patch adds support for a configure script and with it
support for disabling inetd support.  See the output from

    ./configure --help

* Add configure script
* Sprinkle #ifdef fairy dust on svc.c when inetd support is disabled
* Use GCC built-in autodep calculator (-MMD -MP)
* Fix name space issue with include files, use relative paths
* Disable username/group name to uid/gid functions in static builds
* Bug out (error) if a user tries to build the bootmisc plugin static

Possibly fixes GitHub issue #5 and issue #6.

NOTE: The static build has not received any testing at all!

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

finit.c

@@ -35,7 +35,7 @@
 #include "svc.h"
 #include "sig.h"
 #include "tty.h"
-#include "lite.h"
+#include "libite/lite.h"
 #include "inetd.h"
 
 int   debug     = 0;
@@ -137,7 +137,11 @@ static int client(int argc, char *argv[])
 static void banner(void)
 {
 	delline();
+#ifdef INIT_HEADING
+	echo("%s", INIT_HEADING);
+#else
 	echo("Finit version " VERSION " (" WHOAMI ") " __DATE__ " " __TIME__);
+#endif
 }
 
 int main(int argc, char* argv[])