Follow up to r1873941: define AP_REG_NO_DEFAULT for raw ap_regcomp() usage.

Follow up to r1873941: define AP_REG_NO_DEFAULT for raw ap_regcomp() usage.

This avoids having to define AP_REG_NO_* for each APR_REG_* specific option,
thus replacing AP_REG_NO_DOTALL introduced lately.

For ap_rxplus_compile() and mod_substitute where default AP_REG_DOTALL is not
suitable, let's use:
    AP_REG_NO_DEFAULT | ap_regcomp_get_default_cflags() & AP_REG_DOLLAR_ENDONLY
to keep the default AP_REG_DOLLAR_ENDONLY unless RegexDefaultOptions unsets it.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1874090 13f79535-47bb-0310-9956-ffa450edef68