BlenderDNA: Silence warning about inline function which is declared but not defined

It's a templated method which is meant to be specialized. The base version
is never called. Just remove 'inline' to make GCC shut up.

code/BlenderDNA.h

@@ -253,7 +253,7 @@ public:
      *  a compiler complain is the result.
      *  @param dest Destination value to be written
      *  @param db File database, including input stream. */
-    template <typename T> inline void Convert (T& dest, const FileDatabase& db) const;
+    template <typename T> void Convert (T& dest, const FileDatabase& db) const;
 
     // --------------------------------------------------------
     // generic converter