cmake: make NGL_ADD_SUBDIR_GUARDED match by basename so MIGRATE_MODULE=Lts/DDS picks Lts/DDS correctly

CMakeLists.txt

@@ -340,7 +340,10 @@ function(NGL_ADD_SUBDIR_GUARDED subdir)
     # normalize to forward slashes
     string(REPLACE "\\" "/" _mig "${MIGRATE_MODULE}")
     string(REPLACE "\\" "/" _sub "${subdir}")
-    if(_mig MATCHES "^${_sub}(/|$)" OR _sub MATCHES "^${_mig}(/|$)")
+    # also compare basenames so MIGRATE_MODULE=Lts/DDS matches subdir 'DDS' when called from Lts
+    get_filename_component(_mig_base "${_mig}" NAME)
+    get_filename_component(_sub_base "${_sub}" NAME)
+    if(_mig MATCHES "^${_sub}(/|$)" OR _sub MATCHES "^${_mig}(/|$)" OR _mig_base STREQUAL _sub OR _sub_base STREQUAL _mig)
       message(STATUS "Including subdir ${subdir} because MIGRATE_MODULE=${MIGRATE_MODULE}")
       add_subdirectory(${subdir})
     else()