tests: let START_SET manage the autorelease pool

START_SET creates an autorelease pool and END_SET releases it, so the pool
these tests create around the set is redundant.

Author: DTW-Thalion

Tests/gui/NSDatePicker/display.m

@@ -30,7 +30,6 @@
 int
 main(int argc, char **argv)
 {
-  CREATE_AUTORELEASE_POOL(arp);
   NSDatePicker *dp;
   NSString *text;
   NSString *american;
@@ -120,6 +119,5 @@
 
   END_SET("NSDatePicker display")
 
-  DESTROY(arp);
   return 0;
 }

Tests/gui/NSDatePicker/keyboard.m

@@ -101,7 +101,6 @@ - (void) datePickerCell: (NSDatePickerCell *)cell
 int
 main(int argc, char **argv)
 {
-  CREATE_AUTORELEASE_POOL(arp);
   NSDatePicker *dp;
   NSDatePickerElementFlags all;
   BOOL generator;
@@ -285,6 +284,5 @@ - (void) datePickerCell: (NSDatePickerCell *)cell
 
   END_SET("NSDatePicker keyboard")
 
-  DESTROY(arp);
   return 0;
 }

Tests/gui/NSDatePicker/selection.m

@@ -77,7 +77,6 @@
 int
 main(int argc, char **argv)
 {
-  CREATE_AUTORELEASE_POOL(arp);
   NSWindow *window;
   NSDatePicker *dp;
   NSString *text;
@@ -151,6 +150,5 @@
 
   END_SET("NSDatePicker selection")
 
-  DESTROY(arp);
   return 0;
 }