Tests: remove unneeded imports.

fastcgi.t

diff --git a/fastcgi.t b/fastcgi.t
index 98605b1..556b1f6 100644
--- a/fastcgi.t
+++ b/fastcgi.t
@@ -11,8 +11,6 @@
 
 use Test::More;
 
-use IO::Select;
-
 BEGIN { use FindBin; chdir($FindBin::Bin); }
 
 use lib 'lib';

memcached.t

diff --git a/memcached.t b/memcached.t
index b40de39..375f967 100644
--- a/memcached.t
+++ b/memcached.t
@@ -11,8 +11,6 @@
 
 use Test::More;
 
-use IO::Select;
-
 BEGIN { use FindBin; chdir($FindBin::Bin); }
 
 use lib 'lib';

smtp-greeting-delay.t

diff --git a/smtp-greeting-delay.t b/smtp-greeting-delay.t
index d4bbcd4..eccc9c2 100644
--- a/smtp-greeting-delay.t
+++ b/smtp-greeting-delay.t
@@ -9,9 +9,6 @@
 
 use Test::More;
 
-use MIME::Base64;
-use Socket qw/ CRLF /;
-
 BEGIN { use FindBin; chdir($FindBin::Bin); }
 
 use lib 'lib';