[Libomptarget][NFC] Remove unused CMake file

Summary:
This file is no longer used, get rid of it.
GitOrigin-RevId: 5afb5312a09377d288d5aba84e042597292f25fa
diff --git a/libomptarget/DeviceRTL/src/CMakeLists.txt b/libomptarget/DeviceRTL/src/CMakeLists.txt
deleted file mode 100644
index ede8b6d..0000000
--- a/libomptarget/DeviceRTL/src/CMakeLists.txt
+++ /dev/null
@@ -1,13 +0,0 @@
-target_sources(omptarget.devicertl PRIVATE
-  Configuration.cpp
-  Debug.cpp
-  Kernel.cpp
-  Mapping.cpp
-  Misc.cpp
-  Parallelism.cpp
-  Reduction.cpp
-  State.cpp
-  Synchronization.cpp
-  Tasking.cpp
-  Utils.cpp
-  Workshare.cpp)