fix part of PR #7528

"UnsetEnv does not work from main body of httpd.conf"
PR also complains:
"also does not unsetenv()", but this fix does not address that
(i doubt unsetenv is portable or threadsafe)
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@90542 13f79535-47bb-0310-9956-ffa450edef68