[NFC] Fix wrong header in `LibC.cpp`

GitOrigin-RevId: 294bbdc0b88b02c8df423fd9c48aea2774e290a2
diff --git a/libomptarget/DeviceRTL/src/LibC.cpp b/libomptarget/DeviceRTL/src/LibC.cpp
index 0f7b656..ee67eed 100644
--- a/libomptarget/DeviceRTL/src/LibC.cpp
+++ b/libomptarget/DeviceRTL/src/LibC.cpp
@@ -1,4 +1,4 @@
-//===------- LibC.c - Simple implementation of libc functions ----- C -----===//
+//===------- LibC.cpp - Simple implementation of libc functions --- C++ ---===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.