more script tests

+ add cgi checks for error in script output
+ fix script_path relative to absolute
+ cgi makefile more efficient

srcs/cgi-bin/cgi_cpp_empty.cpp

@@ -0,0 +1,12 @@
+
+# include "cgi_utils.hpp"
+
+int main (int ac, char **av, char ** env)
+{
+	(void)ac;
+	(void)av;
+	(void)env;
+
+	return 0;
+}
+