pgsql: Don't use 'bool' as a struct member name in help_config.c.

Don't use 'bool' as a struct member name in help_config.c.

Doing so doesn't work if bool is a macro rather than a typedef.

Although c.h spends some effort to support configurations where bool is
a preexisting macro, help_config.c has existed this way since
2003 (b700a6), and there have not been any reports of
problems. Backpatch anyway since this is as riskless as it gets.

Discussion: 20150812084351(dot)GD8470(at)awork2(dot)anarazel(dot)de
Backpatch: 9.0-master

Branch
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REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/c9b727310b4488a15795464a5fb1f3153738076a

Modified Files
--------------
src/backend/utils/misc/help_config.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)