Remove unused wxIFFDecoder::picptr member variable.

This variable was apparently unused and a local variable with the same name
was used instead, resulting in Sun CC warnings about variable shadowing.

Just remove the unused member variable to fix this.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69562 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/imagiff.cpp

@@ -81,7 +81,6 @@ private:
     IFFImage *m_image;        // image data
     wxInputStream *m_f;       // input stream
     unsigned char *databuf;
-    unsigned char *picptr;
     unsigned char *decomp_mem;
 
     void Destroy();