stdbool.h: Make conformant to ISOC99
stdbool.h: Make conformant to ISOC99

For conformance to ISO C the stdbool.h header has to provide
the macro __bool_true_false_are_defined (defined to 1).  Yep,
that name is really in the standard.

andrewchambers/tccmirror,run4flat/tinycc,avih/tinycc,andreiw/tinycc,run4flat/tinycc,seyko2/tinycc,andrewchambers/tccmirror,seyko2/tinycc,alfonsokim/tinycc,gfwilliams/tinycc,rchandramouli/tinycc,andreiw/tinycc,fstudio/tinycc,metaeducation/tcc,avih/tinycc,seyko2/tinycc,alfonsokim/tinycc,alfonsokim/tinycc,mirror/tinycc,run4flat/tinycc,gfwilliams/tinycc,leeduhem/tinycc,code4game/tinycc,andrewchambers/tccmirror,alfonsokim/tinycc,metaeducation/tcc,andreiw/tinycc,code4game/tinycc,leeduhem/tinycc,rchandramouli/tinycc,alfonsokim/tinycc,andrewchambers/tccmirror,run4flat/tinycc,avih/tinycc,mingodad/tinycc,leeduhem/tinycc,metaeducation/tcc,leeduhem/tinycc,fstudio/tinycc,fstudio/tinycc,gfwilliams/tinycc,metaeducation/tcc,fstudio/tinycc,mingodad/tinycc,avih/tinycc,leeduhem/tinycc,mirror/tinycc,gfwilliams/tinycc,seyko2/tinycc,mingodad/tinycc,rchandramouli/tinycc,seyko2/tinycc,mirror/tinycc,code4game/tinycc,metaeducation/tcc,rchandramouli/tinycc,mingodad/tinycc,mirror/tinycc,gfwilliams/tinycc,fstudio/tinycc,andrewchambers/tccmirror,rchandramouli/tinycc,run4flat/tinycc