Update to build on Xcode 6.0: delete called on that is abstract but has non-virtual dest

indra/llappearance/lltexturemanagerbridge.h

@@ -35,6 +35,8 @@
 class LLTextureManagerBridge
 {
 public:
+    virtual ~LLTextureManagerBridge() {}
+
 	virtual LLPointer<LLGLTexture> getLocalTexture(BOOL usemipmaps = TRUE, BOOL generate_gl_tex = TRUE) = 0;
 	virtual LLPointer<LLGLTexture> getLocalTexture(const U32 width, const U32 height, const U8 components, BOOL usemipmaps, BOOL generate_gl_tex = TRUE) = 0;
 	virtual LLGLTexture* getFetchedTexture(const LLUUID &image_id) = 0;