cmGeneratorTarget: Record when imported target link iface libs are done
`GetImportLinkInterface` populates the link interface from properties
of imported targets. Make it more closely match the link interface
of in-project targets by recording the `LibrariesDone` field.
diff --git a/Source/cmGeneratorTarget.cxx b/Source/cmGeneratorTarget.cxx
index 1493f24..cdaf44c 100644
--- a/Source/cmGeneratorTarget.cxx
+++ b/Source/cmGeneratorTarget.cxx
@@ -7284,6 +7284,7 @@
cmOptionalLinkInterface& iface = hm[headTarget];
if (!iface.AllDone) {
iface.AllDone = true;
+ iface.LibrariesDone = true;
iface.Multiplicity = info->Multiplicity;
cmExpandList(info->Languages, iface.Languages);
this->ExpandLinkItems(info->LibrariesProp, cmMakeRange(info->Libraries),
