Add compiler test for puts libc function

compiler/compiler_test.go

@@ -9,6 +9,13 @@ testUnit (test,
 0,
 )}
 
+func TestPuts (test *testing.T) {
+testUnit (test,
+"/test-data/data/puts", nil,
+"", "hello\n",
+0,
+)}
+
 func TestExitCode13 (test *testing.T) {
 testUnit (test,
 "/test-data/data/exit-code-13", nil,

compiler/test-data/data/puts/fspl.mod

@@ -0,0 +1,2 @@
+'aaad83b9-6610-45c4-ad89-4c28cf3a3b26'
++ 'cstdio'

compiler/test-data/data/puts/main.fspl

@@ -0,0 +1,4 @@
+[main]: I32 'main' = {
+	cstdio::[puts 'hello']
+	0
+}