Merge r1343109:

    Make ap_regcomp() return AP_REG_ESPACE if out of memory.  Make ap_pregcomp()
    abort if out of memory.
    
    This raises the minimum PCRE requirement to version 6.0, released in 2005.

Reviewed by: jim, sf, minfrin



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1418930 13f79535-47bb-0310-9956-ffa450edef68