Remove usages of std::auto_ptr to get rid of warnings when building with

gcc 8.2+

src/SFML/Audio/AudioDevice.cpp

@@ -29,7 +29,7 @@
 #include <SFML/Audio/ALCheck.hpp>
 #include <SFML/Audio/Listener.hpp>
 #include <SFML/System/Err.hpp>
-#include <memory>
+#include <vector>
 
 
 namespace
@@ -107,9 +107,13 @@ bool AudioDevice::isExtensionSupported(const std::string& extension)
     // This device will not be used in this function and merely
     // makes sure there is a valid OpenAL device for extension
     // queries if none has been created yet.
-    std::auto_ptr<AudioDevice> device;
+    //
+    // Using an std::vector for this since auto_ptr is deprecated
+    // and we have no better STL facility for dynamically allocating
+    // a temporary instance with strong exception guarantee.
+    std::vector<AudioDevice> device;
     if (!audioDevice)
-        device.reset(new AudioDevice);
+        device.resize(1);
 
     if ((extension.length() > 2) && (extension.substr(0, 3) == "ALC"))
         return alcIsExtensionPresent(audioDevice, extension.c_str()) != AL_FALSE;
@@ -125,9 +129,13 @@ int AudioDevice::getFormatFromChannelCount(unsigned int channelCount)
     // This device will not be used in this function and merely
     // makes sure there is a valid OpenAL device for format
     // queries if none has been created yet.
-    std::auto_ptr<AudioDevice> device;
+    //
+    // Using an std::vector for this since auto_ptr is deprecated
+    // and we have no better STL facility for dynamically allocating
+    // a temporary instance with strong exception guarantee.
+    std::vector<AudioDevice> device;
     if (!audioDevice)
-        device.reset(new AudioDevice);
+        device.resize(1);
 
     // Find the good format according to the number of channels
     int format = 0;