Get rid of bogus warnings when using '-Wall -Wshadow -Wmissing-prototypes

-Wmissing-declarations':

   http_protocol.c: In function `ap_set_byterange':
   http_protocol.c:274: warning: `one_start' might be used uninitialized
     in this function
   http_protocol.c:274: warning: `one_end' might be used uninitialized in
     this function

clearly, this isn't the case...

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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@88193 13f79535-47bb-0310-9956-ffa450edef68