Pinning GFHeader to front of modern

- Pinning the GF Header, crt0, and main to the front of the ROM when building modern.
- Moving the gflib before other source files, to make it closer to the non-modern linker script (and therefore smaller patches).

ld_script_modern.txt

@@ -49,8 +49,11 @@ SECTIONS {
     ALIGN(4)
     {
         src/rom_header.o(.text*);
-        src/*.o(.text*);
+        src/rom_header_gf.o(.text.*);
+        src/crt0.o(.text);
+        src/main.o(.text);
         gflib/*.o(.text*);
+        src/*.o(.text*);
         asm/*.o(.text*);
     } =0