[olympic,nostalgia] Make Applib an interface library that publicly exports applib.cpp

src/olympic/applib/CMakeLists.txt

@@ -0,0 +1,9 @@
+
+add_library(
+    OlympicApplib INTERFACE
+)
+
+target_sources(
+    OlympicApplib INTERFACE
+        applib.cpp
+)