clean out obj dir before running mini test.

tests/runminitest.d

@@ -22,9 +22,15 @@ int main(string[] args)
     string[] norunfailed;
 
     chdir("mini");
-    if(!exists("obj"))
+
+    if (!exists("obj"))
         mkdir("obj");
 
+    foreach(f; listdir("./obj", "*"))
+    {
+        std.file.remove(f);
+    }
+
     static int classify(char[] name)
     {
         if (find(name, "compile_") == 0)
@@ -42,6 +48,7 @@ int main(string[] args)
     foreach(c; contents) {
         auto testname = getName(getBaseName(c));
         writefln("TEST NAME: ", testname);
+
         string cmd = format("llvmdc %s -quiet -ofobj/%s -odobj", c, testname);
         foreach(v; args[1..$]) {
             cmd ~= ' ';