Improve weak aliases handling
Improve weak aliases handling

* Include only the STB_GLOBAL alias symbol in .dynsym section
* Stop the loop when STB_GLOBAL symbol is found
* Reword / simplify comment

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