configure: prefer here-documents
configure: prefer here-documents

* configure: use here-documents to improve readability and
reduce the clutter.

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