Fix ra-test execution of svnserve in some build environments (closes #25):

* subversion/tests/libsvn_ra/ra-test.c
  (open_tunnel): Execute svnserve with APR_PROGRAM_ENV rather than
  APR_PROGRAM, so the environment is inherited from the build rather
  than empty. svnserve may depend on the $LD_LIBRARY_PATH setting,
  for example.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1922983 13f79535-47bb-0310-9956-ffa450edef68

Author: notroj

subversion/tests/libsvn_ra/ra-test.c

@@ -277,7 +277,7 @@ open_tunnel(svn_stream_t **request, svn_stream_t **response,
   if (status == APR_SUCCESS)
     status = apr_procattr_io_set(attr, 1, 1, 0);
   if (status == APR_SUCCESS)
-    status = apr_procattr_cmdtype_set(attr, APR_PROGRAM);
+    status = apr_procattr_cmdtype_set(attr, APR_PROGRAM_ENV);
   proc = apr_palloc(pool, sizeof(*proc));
   if (status == APR_SUCCESS)
     status = apr_proc_create(proc,