Handle alphanumeric characters in matching GUC names

The check for whether all GUCs are present in the sample config
file used the POSIX character class :alpha: which corresponds to
alphabet and not alphanumeric. Since GUC names can contain digits
as well we need to use the :alnum: character class instead.

Author: Daniel Gustafsson <dan...@yesql.se>
Discussion: https://postgr.es/m/2cb04559-b1d8-4558-b6f0-8f09093d6...@yesql.se

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/f81855171f95c4440d1d9f41bc9e5ac47eafb7a0

Modified Files
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src/test/modules/test_misc/t/003_check_guc.pl | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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