[SYCL][NFC] Fix warning in self-build (#3023)

Implicit conversion between pointer-to-function and pointer-to-object is a Microsoft extension

Author: Alexander Batashev

sycl/source/detail/plugin_printers.hpp

@@ -12,15 +12,26 @@
 
 #include <CL/sycl/detail/pi.hpp>
 
+#include <type_traits>
+
 __SYCL_INLINE_NAMESPACE(cl) {
 namespace sycl {
 namespace detail {
 namespace pi {
 
-template <typename T> inline void print(T val) {
+template <typename T>
+inline typename std::enable_if<!std::is_pointer<T>::value, void>::type
+print(T val) {
   std::cout << "<unknown> : " << val << std::endl;
 }
 
+template <typename T>
+inline typename std::enable_if<std::is_pointer<T>::value, void>::type
+print(T val) {
+  std::cout << "<unknown> : " << reinterpret_cast<const void *>(val)
+            << std::endl;
+}
+
 template <> inline void print<>(PiPlatform val) {
   std::cout << "pi_platform : " << val << std::endl;
 }