Trade: c'mon, old compilers.

doc/snippets/MagnumTrade.cpp

@@ -65,6 +65,8 @@ using namespace Magnum::Math::Literals;
 
 int main() {
 
+/* GCC 4.8 and Clang 3.8 has problems with an implicit cast here */
+#if (defined(CORRADE_TARGET_UNIX) || (defined(CORRADE_TARGET_WINDOWS) && !defined(CORRADE_TARGET_WINDOWS_RT))) && (!defined(CORRADE_TARGET_GCC) || __GNUC__ > 5 || (!defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ >= 4) || (defined(CORRADE_TARGET_APPLE_CLANG) && __clang_major__ >= 9))
 {
 /* [blob-deserialize-mesh] */
 Containers::Array<const char, Utility::Directory::MapDeleter> blob =
@@ -77,6 +79,7 @@ if(!spaceship) Fatal{} << "oh no";
 // ...
 /* [blob-deserialize-mesh] */
 }
+#endif
 
 {
 /* [AbstractImporter-usage] */

src/Magnum/Trade/sceneconverter.cpp

@@ -132,7 +132,8 @@ class BlobImporter: public Trade::AbstractImporter {
 
     UnsignedInt doMeshCount() const override { return 1; }
     Containers::Optional<Trade::MeshData> doMesh(UnsignedInt, UnsignedInt) override {
-        return Trade::MeshData::deserialize(_in);
+        /* GCC 4.8 and old Clang has problems with an implicit cast here */
+        return Trade::MeshData::deserialize(Containers::ArrayView<const void>(_in));
     }
 
     Containers::Array<const char, Utility::Directory::MapDeleter> _in;