Bump version to 1.635 and update Changes

Also avoid warning in t/lib.pl

Changes

@@ -6,11 +6,11 @@ DBI::Changes - List of significant changes to the DBI
 
 =cut
 
-=head2 Changes in DBI 1.634_50
+=head2 Changes in DBI 1.635 - 24th April 2016
 
     Fixed RaiseError/PrintError for UTF-8 errors/warnings. RT#102404
     Fixed cases where ShowErrorStatement might show incorrect Statement RT#97434
-    Fixed DBD::Gofer for utf8-enabled STDIN/STDOUT
+    Fixed DBD::Gofer for UTF-8-enabled STDIN/STDOUT
         thanks to mauke PR#32
     Fixed fetchall_arrayref({}) behavior with no columns
         thanks to Dan McGee PR#31
@@ -41,6 +41,35 @@ DBI::Changes - List of significant changes to the DBI
     Removed the ancient DBI::FAQ module RT#102714
     Fixed t/pod.t to require Test::Pod >= 1.41 RT#101769
 
+This release was developed at the Perl QA Hackathon 2016
+L<http://act.qa-hackathon.org/qa2016/>
+which was made possible by the generosity of many sponsors:
+
+L<https://www.fastmail.com> FastMail,
+L<https://www.ziprecruiter.com> ZipRecruiter,
+L<http://www.activestate.com> ActiveState,
+L<http://www.opusvl.com> OpusVL,
+L<https://www.strato.com> Strato,
+L<http://www.surevoip.co.uk> SureVoIP,
+L<http://www.cv-library.co.uk> CV-Library,
+L<https://www.iinteractive.com/> Infinity,
+L<https://opensource.careers/perl-careers/> Perl Careers,
+L<https://www.mongodb.com> MongoDB,
+L<https://www.thinkproject.com> thinkproject!,
+L<https://www.dreamhost.com/> Dreamhost,
+L<http://www.perl6.org/> Perl 6,
+L<http://www.perl-services.de/> Perl Services,
+L<https://www.evozon.com/> Evozon,
+L<http://www.booking.com> Booking,
+L<http://eligo.co.uk> Eligo,
+L<http://www.oetiker.ch/> Oetiker+Partner,
+L<http://capside.com/en/> CAPSiDE,
+L<https://www.procura.nl/> Procura,
+L<https://constructor.io/> Constructor.io,
+L<https://metacpan.org/author/BABF> Robbie Bow,
+L<https://metacpan.org/author/RSAVAGE> Ron Savage,
+L<https://metacpan.org/author/ITCHARLIE> Charlie Gonzalez,
+L<https://twitter.com/jscook2345> Justin Cook.
 
 =head2 Changes in DBI 1.634 - 3rd August 2015
 

DBI.pm

@@ -11,7 +11,7 @@ package DBI;
 require 5.008_001;
 
 BEGIN {
-our $XS_VERSION = our $VERSION = "1.634"; # ==> ALSO update the version in the pod text below!
+our $XS_VERSION = our $VERSION = "1.635"; # ==> ALSO update the version in the pod text below!
 $VERSION = eval $VERSION;
 }
 
@@ -146,7 +146,7 @@ sure that your issue isn't related to the driver you're using.
 
 =head2 NOTES
 
-This is the DBI specification that corresponds to DBI version 1.634
+This is the DBI specification that corresponds to DBI version 1.635
 (see L<DBI::Changes> for details).
 
 The DBI is evolving at a steady pace, so it's good to check that

t/lib.pl

@@ -20,7 +20,7 @@ sub test_dir
 	$test_dir = File::Spec->rel2abs( File::Spec->curdir () );
 	$test_dir = File::Spec->catdir ( $test_dir, "test_output_" . $$ );
 	$test_dir = VMS::Filespec::unixify($test_dir) if $^O eq 'VMS';
-	rmtree $test_dir;
+	rmtree $test_dir if -d $test_dir;
 	mkpath $test_dir;
 	# There must be at least one directory in the test directory,
 	# and nothing guarantees that dot or dot-dot directories will exist.