fix install destination of executables for iOS/tvOS/watchOS

see https://cmake.org/cmake/help/latest/policy/CMP0006.html

src/CMakeLists.txt

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 5d75b8a..a0f5325 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -4,7 +4,7 @@
   target_link_libraries(${PROGRAM} zip)
   target_include_directories(${PROGRAM} PRIVATE BEFORE ${PROJECT_SOURCE_DIR}/lib ${PROJECT_BINARY_DIR})
   if(LIBZIP_DO_INSTALL)
-    install(TARGETS ${PROGRAM} EXPORT ${PROJECT_NAME}-targets RUNTIME DESTINATION bin)
+    install(TARGETS ${PROGRAM} EXPORT ${PROJECT_NAME}-targets DESTINATION bin)
   endif()
   if(NOT HAVE_GETOPT)
     target_sources(${PROGRAM} PRIVATE getopt.c)