- updated the makefiles and code to allow compliation with MinGW once again (some of patch #875485 by perditionc)

- fixed errors and warnings given by gcc


git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@3513 212acab6-be3b-0410-9dea-997c60f758d6

Source/clzma.h

@@ -50,7 +50,7 @@ public:
     InitializeCriticalSection(&cs);
   }
 
-  ~CLZMA()
+  virtual ~CLZMA()
   {
     End();
     DeleteCriticalSection(&cs);
@@ -79,7 +79,7 @@ public:
       NCoderPropID::kDictionarySize,
       NCoderPropID::kNumFastBytes
     };
-    const kNumProps = sizeof(propdIDs) / sizeof(propdIDs[0]);
+    const int kNumProps = sizeof(propdIDs) / sizeof(propdIDs[0]);
     PROPVARIANT props[kNumProps];
     // NCoderPropID::kAlgorithm
     props[0].vt = VT_UI4;
@@ -318,4 +318,4 @@ public:
   const char *GetName() { return "lzma"; }
 };
 
-#endif
+#endif