More ap_expr updates:
- minor bump for ap_expr_exec_re() introduced in r1037504
- actually commit the changes to allow using backreferences in SetEnvIfExpr
- automatically add the correct entries to the Vary-header if the result of
an expression evaluation depends on a request header
(can be turned off by setting the AP_EXPR_FLAGS_DONT_VARY flag)
- set AP_EXPR_FLAGS_DONT_VARY in mod_log_config's conditional logging
- fix various off-by-one errors in req_table_func
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httpd/httpd/trunk/include/ap_expr.h