[libomptarget] Remove two unneeded includes, NFCI.

Follow-up to r340542 and r340767.

git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@341563 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/libomptarget/src/interface.cpp b/libomptarget/src/interface.cpp
index f2372f5..266e085 100644
--- a/libomptarget/src/interface.cpp
+++ b/libomptarget/src/interface.cpp
@@ -20,7 +20,6 @@
 
 #include <cassert>
 #include <cstdlib>
-#include <stdarg.h>
 #include <mutex>
 
 // Store target policy (disabled, mandatory, default)
diff --git a/libomptarget/src/omptarget.cpp b/libomptarget/src/omptarget.cpp
index 447820d..233de9e 100644
--- a/libomptarget/src/omptarget.cpp
+++ b/libomptarget/src/omptarget.cpp
@@ -20,7 +20,6 @@
 
 #include <cassert>
 #include <vector>
-#include <mutex>
 
 #ifdef OMPTARGET_DEBUG
 int DebugLevel = 0;