Math: remove transitive include for Functions.h.

Co-authored-by: Vladimír Vondruš <mosra@centrum.cz>

src/Magnum/Math/Range.h

@@ -34,7 +34,8 @@
    all have it directly in <type_traits> because it just makes sense */
 #include <type_traits>
 
-#include "Magnum/Math/Functions.h"
+/* Taking also scalar min()/max() from here, which is otherwise advertised in
+   Functions.h */
 #include "Magnum/Math/Vector3.h"
 
 #ifdef MAGNUM_BUILD_DEPRECATED

src/Magnum/Text/AbstractGlyphCache.cpp

@@ -33,6 +33,7 @@
 #include <Corrade/Containers/Triple.h>
 
 #include "Magnum/ImageView.h"
+#include "Magnum/Math/Functions.h"
 #include "Magnum/Math/Range.h"
 #include "Magnum/Text/Implementation/abstractGlyphCacheState.h"
 

src/Magnum/Vk/Pipeline.cpp

@@ -32,6 +32,7 @@
 #include <Corrade/Containers/Array.h>
 #include <Corrade/Containers/BigEnumSet.hpp>
 
+#include "Magnum/Math/Functions.h" /* popcount() */
 #include "Magnum/Vk/Assert.h"
 #include "Magnum/Vk/Device.h"
 #include "Magnum/Vk/Handle.h"