Fix Clang's -Wunused-template warning better.

As was the case in Corrade, this was due to an extra `static`. Except
for the warning in the snippet file, where I don't see any other way how
to suppress it.

This partially reverts commit b8bddc438c.

doc/snippets/SceneGraph.cpp

@@ -147,7 +147,8 @@ class CachingObject: public Object3D, SceneGraph::AbstractFeature3D {
 namespace {
 
 /* Clang 23 adds -Wunused-template to -Wall and then warns about the unused
-   constructor. Well, this is a doc snippet, so what am I supposed to do? */
+   (template) constructor. Well, this is a doc snippet, so what am I supposed
+   to do? */
 #ifdef CORRADE_TARGET_CLANG
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wunused-template"

src/Magnum/Math/FunctionsBatch.h

@@ -49,21 +49,9 @@ namespace Implementation {
 
 /** @todo Utility/Algorithms.h has a similar (but different) variant of this,
     maybe turn that into some public utility once we have one more use case? */
-/* Clang since version 23 includes -Wunused-template in -Wall, and warns for
+template<class T, class View = decltype(Containers::Implementation::ErasedArrayViewConverter<typename std::remove_reference<T&&>::type>::from(std::declval<T&&>()))> auto stridedArrayViewTypeFor(T&&) -> typename std::remove_const<typename View::Type>::type;
-   those declarations. The templates are used inside a decltype() expression
+template<class T> typename std::remove_const<T>::type stridedArrayViewTypeFor(const Containers::ArrayView<T>&);
-   below (and commenting them out obviously makes the test fail to compile) so
+template<class T> typename std::remove_const<T>::type stridedArrayViewTypeFor(const Containers::StridedArrayView1D<T>&);
-   this is yet another completely pointless warning that just wastes my
-   time. */
-#ifdef CORRADE_TARGET_CLANG
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wunused-template"
-#endif
-template<class T, class View = decltype(Containers::Implementation::ErasedArrayViewConverter<typename std::remove_reference<T&&>::type>::from(std::declval<T&&>()))> static auto stridedArrayViewTypeFor(T&&) -> typename std::remove_const<typename View::Type>::type;
-template<class T> static typename std::remove_const<T>::type stridedArrayViewTypeFor(const Containers::ArrayView<T>&);
-template<class T> static typename std::remove_const<T>::type stridedArrayViewTypeFor(const Containers::StridedArrayView1D<T>&);
-#ifdef CORRADE_TARGET_CLANG
-#pragma clang diagnostic pop
-#endif
 
 }