WIN32: fix roken build

__declspec not _declspec

Include "err.h" not <err.h>

Include "roken.h" before "err.h"

Indent "#if" as "# if" within roken.h.in when CPP rules must be copied
into the generated "roken.h".

Correct verr() attribute to be ROKEN_LIB_NORETURN_FUNCTION.

Change-Id: I4289ecaba4a097175b4a5a1cde529b59038c72e3

lib/roken/warn.c

@@ -33,6 +33,7 @@
 
 #include <config.h>
 
+#include "roken.h"
 #include "err.h"
 
 void