LibElf: Remove declarations for non-existent methods

Author: https://github.com/AtkinsSJ
Commit: https://github.com/SerenityOS/serenity/commit/12673d0e24
Pull-request: https://github.com/SerenityOS/serenity/pull/17203
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibELF/Image.h

@@ -183,7 +183,6 @@ public:
     Symbol symbol(unsigned) const;
     Section section(unsigned) const;
     ProgramHeader program_header(unsigned) const;
-    FlatPtr program_header_table_offset() const;
 
     template<IteratorFunction<Image::Section> F>
     void for_each_section(F) const;