Begining stub of NONAC_LDFLAGS and NONAC_CFLAGS stuff.

First of all, avoid re-adding values to the various hints
each time called (not a problem now, but could be later).
Then build up CFLAGS/LDFLAGS during Makefile generation.

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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@87655 13f79535-47bb-0310-9956-ffa450edef68