Do not redefine a stripped-down LyXRC object.

I am not sure why it was done this way, but it is not really necessary.
Moreover gcc LTO does not like it.

src/client/client.cpp

@@ -12,6 +12,8 @@
 
 #include <config.h>
 
+#include "LyXRC.h"
+
 #include "support/ConsoleApplication.h"
 #include "support/debug.h"
 #include "support/FileName.h"
@@ -70,9 +72,8 @@ namespace lyx {
 bool verbose = false;
 
 // Dummy LyXRC support
-struct LyXRC {
-	string icon_set;
-} lyxrc;
+LyXRC::LyXRC() {}
+LyXRC lyxrc;
 
 // Keep the linker happy on Windows
 void lyx_exit(int)

src/tex2lyx/dummy_impl.cpp

@@ -20,6 +20,7 @@
 
 #include "Format.h"
 #include "LaTeXFeatures.h"
+#include "LyXRC.h"
 #include "output_xhtml.h"
 
 #include "support/Messages.h"
@@ -58,7 +59,8 @@ bool verbose = false;
 //
 
 
-class LyXRC {} lyxrc;
+LyXRC::LyXRC() {}
+LyXRC lyxrc;
 
 
 //