change make_directory behavior on Linux to match Windows behavior

src/linux/base/linux_base.c

@@ -1159,6 +1159,11 @@ make_directory(String8 path)
   {
     result = 1;
   }
+  else
+  {
+    // match windows behavior
+    result = file_path_exists(path);
+  }
   scratch_end(scratch);
   return result;
 }

src/metagen/metagen_os/core/linux/metagen_os_core_linux.c

@@ -0,0 +1 @@
+