Assorted small soundsystem related fixes.

src/ATCDCL/AIPlane.cxx

@@ -24,6 +24,7 @@
 #include <simgear/sound/soundmgr_openal.hxx>
 #include <math.h>
 #include <string>
+#include <memory>
 using std::string;
 
 
@@ -200,8 +201,9 @@ void FGAIPlane::Render(const string& refname, const float volume, bool repeating
 	if(voice) {
 	    string buf = vPtr->WriteMessage((char*)pending_transmission.c_str(), voice);
 	    if(voice && (volume > 0.05)) {
+                std::auto_ptr<unsigned char> ptr( buf.c_str() );
 		SGSoundSample* simple = 
-		    new SGSoundSample((unsigned char*)buf.c_str(), buf.length(), 8000 );
+		    new SGSoundSample(ptr, buf.length(), 8000 );
                 // TODO - at the moment the volume can't be changed 
 		// after the transmission has started.
 		simple->set_volume(volume);

src/ATCDCL/ATC.cxx

@@ -25,6 +25,7 @@
 #include "ATC.hxx"
 
 #include <iostream>
+#include <memory>
 
 #include <simgear/sound/soundmgr_openal.hxx>
 #include <simgear/structure/exception.hxx>
@@ -237,8 +238,7 @@ void FGATC::Render(string& msg, const float volume,
 // >>> Beware: must pass a (new) object to the (add) method,
 // >>> because the (remove) method is going to do a (delete)
 // >>> whether that's what you want or not.
-				std::auto_ptr<unsigned char> ptr;
-                                ptr.reset((unsigned char*) buf.c_str());
+				std::auto_ptr<unsigned char> ptr( (unsigned char*)buf.c_str() );
 				SGSoundSample *simple = 
 				    new SGSoundSample(ptr,  buf.length(), 8000);
 				// TODO - at the moment the volume can't be changed 

src/Sound/beacon.cxx

@@ -21,6 +21,8 @@
 // $Id$
 
 
+#include <memory>
+
 #include "beacon.hxx"
 
 #include <simgear/structure/exception.hxx>

src/Sound/morse.cxx

@@ -21,6 +21,8 @@
 // $Id$
 
 
+#include <memory>
+
 #include <simgear/constants.h>
 
 #include "morse.hxx"