Fix build with GCC-4.6

Patch written by Kacper Kowalik <xarthisius@gentoo.org>

--- mozilla-1.9.2/xpcom/glue/nsEnumeratorUtils.cpp
+++ mozilla-1.9.2/xpcom/glue/nsEnumeratorUtils.cpp
@@ -66,6 +66,8 @@
         return const_cast<EmptyEnumeratorImpl*>(&kInstance);
     }
 
+    EmptyEnumeratorImpl() {;}
+
 private:
     static const EmptyEnumeratorImpl kInstance;
 };
--- mozilla-1.9.2/xpcom/base/nsDebugImpl.h
+++ mozilla-1.9.2/xpcom/base/nsDebugImpl.h
@@ -45,6 +45,8 @@
     NS_DECL_NSIDEBUG2
     
     static NS_METHOD Create(nsISupports* outer, const nsIID& aIID, void* *aInstancePtr);
+
+    nsDebugImpl() {;}
 };
 
 
--- mozilla-1.9.2/xpcom/base/nsTraceRefcntImpl.h
+++ mozilla-1.9.2/xpcom/base/nsTraceRefcntImpl.h
@@ -73,6 +73,9 @@
   static NS_COM void SetActivityIsLegal(PRBool aLegal);
 
   static NS_METHOD Create(nsISupports* outer, const nsIID& aIID, void* *aInstancePtr);
+
+  nsTraceRefcntImpl() {;}
+
 };
 
 #define NS_TRACE_REFCNT_CONTRACTID "@mozilla.org/xpcom/trace-refcnt;1"
--- mozilla-1.9.2/xpcom/io/nsUnicharInputStream.h
+++ mozilla-1.9.2/xpcom/io/nsUnicharInputStream.h
@@ -57,6 +57,8 @@
 
   static NS_COM nsSimpleUnicharStreamFactory* GetInstance();
 
+  nsSimpleUnicharStreamFactory() {;}
+
 private:
   static const nsSimpleUnicharStreamFactory kInstance;
 };
--- mozilla-1.9.2/intl/unicharutil/util/nsUnicharUtils.h
+++ mozilla-1.9.2/intl/unicharutil/util/nsUnicharUtils.h
@@ -77,6 +77,8 @@
                           PRUint32 aLength) const;
   virtual int operator() (PRUnichar,
                           PRUnichar) const;
+
+  nsCaseInsensitiveStringComparator() {;}
 };
 
 class nsCaseInsensitiveStringArrayComparator
--- mozilla-1.9.2/toolkit/xre/nsAppRunner.cpp
+++ mozilla-1.9.2/toolkit/xre/nsAppRunner.cpp
@@ -650,6 +650,7 @@
 #ifdef XP_WIN
   NS_DECL_NSIWINAPPHELPER
 #endif
+  nsXULAppInfo() {;}
 };
 
 NS_INTERFACE_MAP_BEGIN(nsXULAppInfo)
--- mozilla-1.9.2/embedding/browser/gtk/src/EmbedPrivate.cpp
+++ mozilla-1.9.2/embedding/browser/gtk/src/EmbedPrivate.cpp
@@ -107,6 +107,7 @@
   NS_DECL_ISUPPORTS_INHERITED
   NS_DECL_NSIDIRECTORYSERVICEPROVIDER
   NS_DECL_NSIDIRECTORYSERVICEPROVIDER2
+  GTKEmbedDirectoryProvider() {;}
 };
 
 static const GTKEmbedDirectoryProvider kDirectoryProvider;