cmake: deduplicate install directives

CMakeLists.txt

@@ -76,27 +76,23 @@ set(CPACK_DEBIAN_PACKAGE_SHLIBDEPS ON)
 IF(NOT WIN32)
     set(CPACK_GENERATOR "DEB;TGZ")
     set(CPACK_PACKAGE_FILE_NAME "${CPACK_PACKAGE_NAME}-${CPACK_PACKAGE_VERSION}.${CMAKE_SYSTEM_PROCESSOR}")
-
-    if (TARGET aptdec)
-        install(TARGETS aptdec)
-        install(DIRECTORY "${PROJECT_SOURCE_DIR}/palettes/" DESTINATION "palettes/")
-    endif()
-
-    install(TARGETS apt)
-    install(FILES ${LIB_C_HEADER_FILES} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/apt)
 else()
     #set(CPACK_GENERATOR "ZIP;NSIS")
     set(CPACK_GENERATOR "ZIP")
     set(CPACK_PACKAGE_FILE_NAME "${CPACK_PACKAGE_NAME}-${CPACK_PACKAGE_VERSION}")
 
     if (TARGET aptdec)
-        install(TARGETS aptdec)
         file(GLOB_RECURSE DLLS *.dll)
         install(FILES ${DLLS} DESTINATION ${CMAKE_INSTALL_BINDIR})
     endif()
-    install(TARGETS apt)
-    install(FILES ${LIB_C_HEADER_FILES} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/apt)
+endif()
+
+if (TARGET aptdec)
+    install(TARGETS aptdec)
     install(DIRECTORY "${PROJECT_SOURCE_DIR}/palettes/" DESTINATION "palettes/")
 endif()
 
+install(TARGETS apt)
+install(FILES ${LIB_C_HEADER_FILES} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/apt)
+
 include(CPack)