When generating modperl_exports.c, we need to ignore symbols only defined under ITHREADS if building against a perl that isn't threaded.
When generating modperl_exports.c, we need to ignore symbols only
defined under ITHREADS if building against a perl that isn't threaded.

PR:
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git-svn-id: b4be4a41b2a3352907de631eb6da1671a2f7b614@71422 13f79535-47bb-0310-9956-ffa450edef68

Distrotech/mod_perl,Distrotech/mod_perl,Distrotech/mod_perl,Distrotech/mod_perl