Force const. expr. in expr_cond outside function
Force const. expr. in expr_cond outside function

Since no code should be generated outside a function, force expr_cond to
only consider constant expression when outside a function since the
generic code can generate some code.

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