[obvious] Do not declare flag_permissive explicitly and delete unused global var

[Manuel López-Ibáñez]

I will commit this as obvious shortly. Bootstrapped and regression
tested x86_64-linux-gnu languages=all,ada,obj-c++

2012-05-03  Manuel López-Ibáñez  <manu@gcc.gnu.org>

gcc/
	* flags.h (flag_permissive): Do not declare.
c-family/
	* c.opt (fpermissive): Add Var(flag_permissive).
gcc/
	* diagnostic.c (diagnostic_report_diagnostic): Handle fpermissive
	option specially.
	* toplev.c (flag_permissive): Do not define.
	* c-tree.h (system_header_p): Delete unused.
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