Cleamup some compiler warnings

eeschema/dialogs/dialog_edit_line_style.cpp

@@ -31,9 +31,6 @@
 #include <sch_edit_frame.h>
 #include <widgets/color_swatch.h>
 
-const int BUTT_COLOR_MINSIZE_X = 32;
-const int BUTT_COLOR_MINSIZE_Y = 20;
-
 
 struct lineTypeStruct
 {

plugins/3d/oce/loadmodel.cpp

@@ -483,7 +483,7 @@ bool readSTEPZ( Handle(TDocStd_Document)& m_doc, const char* aFileName )
         ifile.Read( buffer, size);
         std::string expanded = gzip::decompress( buffer, size );
 
-        delete buffer;
+        delete[] buffer;
 
         ofile.Write( expanded.data(), expanded.size() );
         ofile.Close();

plugins/3d/vrml/vrml.cpp

@@ -187,7 +187,7 @@ SCENEGRAPH* LoadVRML( const wxString& aFileName, bool useInline )
             ifile.Read( buffer, size);
             std::string expanded = gzip::decompress( buffer, size );
 
-            delete buffer;
+            delete[] buffer;
 
             ofile.Write( expanded.data(), expanded.size() );
             ofile.Close();