Sprinkle a few <cstdlib> includes, for libomptarget sources using

malloc, free, alloca and getenv.  NFCI.


git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@322869 91177308-0d34-0410-b5e6-96231b3b80d8

Author: DimitryAndric

libomptarget/src/api.cpp

@@ -19,6 +19,7 @@
 
 #include <climits>
 #include <cstring>
+#include <cstdlib>
 
 EXTERN int omp_get_num_devices(void) {
   RTLsMtx.lock();

libomptarget/src/interface.cpp

@@ -19,6 +19,7 @@
 #include "rtl.h"
 
 #include <cassert>
+#include <cstdlib>
 
 ////////////////////////////////////////////////////////////////////////////////
 /// adds a target shared library to the target execution image

libomptarget/src/rtl.cpp

@@ -16,6 +16,7 @@
 #include "rtl.h"
 
 #include <cassert>
+#include <cstdlib>
 #include <cstring>
 #include <dlfcn.h>
 #include <mutex>