r22898 | kameshj | 2007-01-04 00:31:10 -0600 (Thu, 04 Jan 2007)

Follow up to r22832.
Post r22832 svn build fails if apr, apu, serf all bundled in the subversion 
src dir.
The cause is bundled apr/apr-util is identified as ./apr/apr-config and 
./apr-util/apu-config for other consumers like serf.
This causes serf's configure to fail.(serf's configure is done from the 
directory $SVN_SRC_DIR/serf.)
The fix is to make apr_config and apu_config as absolute path.

* build/ac-macros/apr.m4
   (SVN_LIB_APR): invoke APR_FIND_APR with absolute source and build dir.

* build/ac-macros/aprutil.m4
   (SVN_LIB_APRUTIL): invoke APR_FIND_APU with absolute source and build dir.

Suggested by: jerekrantz
Approved by: dlr, jerekrantz