Fix build failure due to unused variables

sycl/source/accessor.cpp

@@ -183,7 +183,7 @@ SampledImageAccessorBaseHost::SampledImageAccessorBaseHost(
     image_channel_order ChannelOrder, image_sampler Sampler,
     const property_list &PropertyList) {
   {
-    auto NoAllowedPropertiesCheck = [](int PropertyKind) { return false; };
+    auto NoAllowedPropertiesCheck = [](int) { return false; };
     detail::PropertyValidator::checkPropsAndThrow(
         PropertyList, NoAllowedPropertiesCheck, NoAllowedPropertiesCheck);
   }

sycl/source/detail/context_impl.cpp

@@ -540,7 +540,7 @@ context_impl::getProgramForHostPipe(const device &Device,
 }
 
 void context_impl::verifyProps(const property_list &Props) const {
-  auto NoAllowedPropertiesCheck = [](int PropertyKind) { return false; };
+  auto NoAllowedPropertiesCheck = [](int) { return false; };
   detail::PropertyValidator::checkPropsAndThrow(Props, NoAllowedPropertiesCheck,
                                                 NoAllowedPropertiesCheck);
 }

sycl/source/detail/sampler_impl.cpp

@@ -158,7 +158,7 @@ sampler_impl::get_coordinate_normalization_mode() const {
 }
 
 void sampler_impl::verifyProps(const property_list &Props) const {
-  auto NoAllowedPropertiesCheck = [](int PropertyKind) { return false; };
+  auto NoAllowedPropertiesCheck = [](int) { return false; };
   detail::PropertyValidator::checkPropsAndThrow(Props, NoAllowedPropertiesCheck,
                                                 NoAllowedPropertiesCheck);
 }

sycl/source/detail/stream_impl.cpp

@@ -99,7 +99,7 @@ void stream_impl::generateFlushCommand(handler &cgh) {
 }
 
 void stream_impl::verifyProps(const property_list &Props) const {
-  auto NoAllowedPropertiesCheck = [](int PropertyKind) { return false; };
+  auto NoAllowedPropertiesCheck = [](int) { return false; };
   detail::PropertyValidator::checkPropsAndThrow(Props, NoAllowedPropertiesCheck,
                                                 NoAllowedPropertiesCheck);
 }

sycl/source/detail/usm/usm_impl.cpp

@@ -650,7 +650,7 @@ void release_from_device_copy(const void *Ptr, const queue &Queue) {
 } // namespace ext::oneapi::experimental
 
 __SYCL_EXPORT void verifyUSMAllocatorProperties(const property_list &PropList) {
-  auto NoAllowedPropertiesCheck = [](int PropertyKind) { return false; };
+  auto NoAllowedPropertiesCheck = [](int) { return false; };
   detail::PropertyValidator::checkPropsAndThrow(
       PropList, NoAllowedPropertiesCheck, NoAllowedPropertiesCheck);
 }