put info into info rule in example

example/obuild.cfg

@@ -1,15 +1,5 @@
 CC = (getenv CC)
 
-if (=s $CC "") [
-    echo "no compiler found, using cc"
-    CC = "cc"
-] [
-    echo "using compiler:" $CC
-]
-
-echo "number of CPUs:" $numcpus
-echo "number of jobs:" $numjobs
-
 rule all test
 
 OBJ = (strreplace (glob "*.c") ".c" ".o")
@@ -29,6 +19,17 @@ rule- clean [
     shell rm -f $OBJ test
 ]
 
+rule- info [
+    if (=s $CC "") [
+        echo "no compiler found, using cc"
+        CC = "cc"
+    ] [
+        echo "using compiler:" $CC
+    ]
+    echo "number of CPUs:" $numcpus
+    echo "number of jobs:" $numjobs
+]
+
 // dependencies
 
 rule foo.o foo.h