Add zlib to tesseract rpath

It's necessary on some platforms so it doesn't find the system zlib, even though it doesn't depend on zlib directly.

component/tesseract/buildout.cfg

@@ -49,7 +49,7 @@ environment =
   ACLOCAL_ARGS=-I${libtool:location}/share/aclocal
   LIBLEPT_HEADERSDIR=${leptonica:location}/include
   CPPFLAGS=-I${leptonica:location}/include
-  LDFLAGS =-L${leptonica:location}/lib -Wl,-rpath=${leptonica:location}/lib -L${jbigkit:location}/lib -Wl,-rpath=${jbigkit:location}/lib
+  LDFLAGS =-L${leptonica:location}/lib -Wl,-rpath=${leptonica:location}/lib -L${jbigkit:location}/lib -Wl,-rpath=${jbigkit:location}/lib -L${zlib:location}/lib -Wl,-rpath=${zlib:location}/lib
 
 [tesseract-eng-traineddata]
 recipe = hexagonit.recipe.download