add a c/raw string interpolation test

vlib/builtin/string_test.v

@@ -517,3 +517,12 @@ fn test_raw_inter() {
 	assert s.contains('$')
 }
 
+fn test_c_r() {
+	// This used to break because of r'' and c''
+	c := 42
+	println('$c')
+	r := 50
+	println('$r')
+	
+}	
+

vlib/compiler/cc.v

@@ -31,7 +31,6 @@ fn (v mut V) cc() {
 	vdir := os.dir(vexe)
 	// Just create a C/JavaScript file and exit
 	// for example: `v -o v.c compiler`
-	println('CC() $v.out_name')
 	if v.out_name.ends_with('.c') || v.out_name.ends_with('.js') {
 		// Translating V code to JS by launching vjs.
 		// Using a separate process for V.js is for performance mostly,