pigz.c: adjust zopfli include path

pigz usually has a zopfli version bundled. But since we denested zopfli,
the include path needs to be adjusted slightly.

Bug: 243389125
Bug: 315488400
Change-Id: Ia90ada0778a5b6b78991d5601753a9fa513491ef
Signed-off-by: Matthias Maennich <maennich@google.com>
diff --git a/pigz.c b/pigz.c
index 0e9d635..a7cb00c 100644
--- a/pigz.c
+++ b/pigz.c
@@ -432,7 +432,7 @@
 #endif
 
 #ifndef NOZOPFLI
-#  include "zopfli/src/zopfli/deflate.h"    // ZopfliDeflatePart(),
+#  include "zopfli/deflate.h"               // ZopfliDeflatePart(),
                                             // ZopfliInitOptions(),
                                             // ZopfliOptions
 #endif