pgsql: Allow pg_rewind tap tests to run with older File::Path versions

Allow pg_rewind tap tests to run with older File::Path versions

Older versions have rmtree but not remove_tree. The one-argument forms
of these are equivalent, so replace remove_tree with rmtree. This allows
the tests to be run on oldish Msys systems.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/7c29764a354a0e7deb3c28e1d5c38ff6662ee3f9

Modified Files
--------------
src/bin/pg_rewind/RewindTest.pm |    6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)