update autoconf for latest compat functions

crypto/compat/getprogname_windows.c

@@ -0,0 +1,13 @@
+#include <stdlib.h>
+
+#include <windows.h>
+
+const char *
+getprogname(void)
+{
+	static char progname[MAX_PATH + 1];
+	DWORD length = GetModuleFileName(NULL, progname, sizeof (progname) - 1);
+	if (length < 0)
+		return "?";
+	return progname;
+}