configure.ac: remove check for broken regex which breaks crosscompilation

in the unlikely case that the user's C library has broken regex support,
she should probably update to a bugfree version.
in its full consequence, checking if individual functions works basically
require to test every single function in use, which is nonsensical.
since this check required to compile and run a code sample on the host,
it cannot be checked in cross-compile scenarios and as it defaulted to yes
(broken), causes build failure in any such scenario.

closes #1

Signed-off-by: John Spencer <maillist-tinyproxy@barfooze.de>
Reviewed-by: Michael Adam <obnox@samba.org>

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