Merge branch 'ps/tests-wo-iconv-fixes'

Some tests assumed "iconv" is available without honoring ICONV prerequisite, which has been corrected. * ps/tests-wo-iconv-fixes: t6006: don't use iconv(1) without ICONV prereq t5550: add ICONV prereq to tests that use "$HTTPD_URL/error" t4205: improve handling of ICONV prerequisite t40xx: don't use iconv(1) without ICONV prereq t: don't set ICONV prereq when iconv(1) is missing