[CBuilder] functions: emit declaration before definition (#112)

closes #1,
i.e. recursice functions should be allowed now.

however, this will not fix the general issue: if a function calls
another function, this second function must still be declared before
the first function ...

Author: cagix

src/main/java/CBuilder/ProgramBuilder.java

@@ -139,8 +139,8 @@ public String buildProgram() {
         program.append('\n');
 
         for (Function f : globalFunctions) {
-            program.append(f.buildCFunction());
             program.append(f.buildFuncObjectDeclaration());
+            program.append(f.buildCFunction());
         }
         program.append('\n');