Remove zipcmp from cmake exports, it is only available for tools builds.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index a4800d9..991f56c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -475,7 +475,7 @@
   )
 
 # Add targets to the build-tree export set
-EXPORT(TARGETS zip zipcmp
+EXPORT(TARGETS zip
   FILE "${PROJECT_BINARY_DIR}/${PROJECT_NAME}-targets.cmake")
 
 # installation