tcc_preprocess: add gcc-style include-depth flags
tcc_preprocess: add gcc-style include-depth flags

    # 1 "main.c"
    # 1 "include/stdio.h" 1
    # 123 "include/stdio.h" 3
    # 10 "main.c" 2

flags: 1: level++; 3: same-level  2: level--

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