Make tccelf.c 64bit ready.
Make tccelf.c 64bit ready.

- Use REL_SECTION_FMT instead of ".rel%s".
- Use PTR_SIZE instead of sizeof(int) for GOT entries.
- Use sizeof(ElfW(Dyn)) instead of magic number 8.
- Use TCC_ELFCLASS instead of ELFCLASS32.

fstudio/tinycc,code4game/tinycc,mitake/tinycc,mitake/tinycc,soywiz/tinycc,FriedBreakfast/tcc,alfonsokim/tinycc,Saectar/inherpreter,acook/tinycc,acook/tinycc,Wallbraker/DCPU-TCC,mingodad/tinycc,gfwilliams/tinycc,andrewchambers/tccmirror,mobiphil/tinnycc,Wallbraker/DCPU-TCC,seyko2/tinycc,soywiz/tinycc,mitake/tinycc,alfonsokim/tinycc,code4game/tinycc,mirror/tinycc,mobiphil/tinnycc,mingodad/tinycc,leeduhem/tinycc,alfonsokim/tinycc,metaeducation/tcc,alfonsokim/tinycc,Archs/TinyCC,acook/tinycc,metaeducation/tcc,FriedBreakfast/tcc,shinh/nacltcc,fstudio/tinycc,mitake/tinycc,Archs/TinyCC,rchandramouli/tinycc,Archs/TinyCC,ftdi-paul-jiao/tinyCC,fstudio/tinycc,Saectar/inherpreter,andrewchambers/tccmirror,Archs/TinyCC,mirror/tinycc,xcm/tcc,leeduhem/tinycc,ftdi-paul-jiao/tinyCC,Saectar/inherpreter,andreiw/tinycc,shinh/nacltcc,soywiz/tinycc,yousong/tinycc,shinh/nacltcc,ftdi-paul-jiao/tinyCC,andrewchambers/tccmirror,gfwilliams/tinycc,leeduhem/tinycc,melkior/tinycc,fstudio/tinycc,run4flat/tinycc,avih/tinycc,Saectar/inherpreter,seyko2/tinycc,andreiw/tinycc,FriedBreakfast/tcc,FriedBreakfast/tcc,yousong/tinycc,mingodad/tinycc,avih/tinycc,rchandramouli/tinycc,rchandramouli/tinycc,gfwilliams/tinycc,run4flat/tinycc,melkior/tinycc,seyko2/tinycc,mirror/tinycc,shinh/nacltcc,andreiw/tinycc,run4flat/tinycc,rchandramouli/tinycc,mirror/tinycc,leeduhem/tinycc,andrewchambers/tccmirror,shinh/nacltcc,avih/tinycc,seyko2/tinycc,metaeducation/tcc,fstudio/tinycc,Saectar/inherpreter,melkior/tinycc,Archs/TinyCC,gfwilliams/tinycc,alfonsokim/tinycc,metaeducation/tcc,Wallbraker/DCPU-TCC,soywiz/tinycc,code4game/tinycc,melkior/tinycc,yousong/tinycc,xcm/tcc,yousong/tinycc,run4flat/tinycc,xcm/tcc,mobiphil/tinnycc,melkior/tinycc,avih/tinycc,seyko2/tinycc,mingodad/tinycc,leeduhem/tinycc,metaeducation/tcc,mobiphil/tinnycc,rchandramouli/tinycc,acook/tinycc,run4flat/tinycc,andrewchambers/tccmirror,ftdi-paul-jiao/tinyCC,FriedBreakfast/tcc,gfwilliams/tinycc