build: Remove CMAKE_SKIP_BUILD_RPATH and SKIP_BUILD_RPATH settings

Remove CMake settings that are no longer needed after reordering Guix build script to perform binary checks after installation.

Also removes unused CMake maintenance targets (check-security and check-symbols) and updates security checks to include libexec/ directory binaries (see PR #31679).

CMakeLists.txt

@@ -621,18 +621,6 @@ if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.29)
   set(CMAKE_SKIP_TEST_ALL_DEPENDENCY FALSE)
 endif()
 
-# TODO: The `CMAKE_SKIP_BUILD_RPATH` variable setting can be deleted
-#       in the future after reordering Guix script commands to
-#       perform binary checks after the installation step.
-# Relevant discussions:
-# - https://github.com/hebasto/bitcoin/pull/236#issuecomment-2183120953
-# - https://github.com/bitcoin/bitcoin/pull/30312#issuecomment-2191235833
-# NetBSD always requires runtime paths to be set for executables.
-if(CMAKE_SYSTEM_NAME STREQUAL "NetBSD")
-  set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
-else()
-  set(CMAKE_SKIP_BUILD_RPATH TRUE)
-endif()
 add_subdirectory(test)
 add_subdirectory(doc)
 
@@ -640,7 +628,6 @@ add_subdirectory(src)
 
 include(Maintenance)
 setup_split_debug_script()
-add_maintenance_targets()
 add_windows_deploy_target()
 add_macos_deploy_target()