Cleaned up NetWare makefiles:

- removed obsolete -prefix compiler switch since already defined global for all files
- removed obsolete include paths
- changed include paths to use internal vars so hat apr/apr-util builds outside source tree
- removed trailing tabs and spaces, other minor cosmetic changes


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.0.x@966915 13f79535-47bb-0310-9956-ffa450edef68