Add version check warnings rollup

Need this to avoid not exists error on @v < 11

Author: BlitzErik

sp_BlitzCache.sql

@@ -4081,7 +4081,9 @@ BEGIN
                     'A high number of plan stubs may result in CMEMTHREAD waits, which you have ' 
 						+ CONVERT(VARCHAR(10), (SELECT CONVERT(DECIMAL(9,0), (dows.wait_time_ms / 60000.)) FROM sys.dm_os_wait_stats AS dows WHERE dows.wait_type = 'CMEMTHREAD')) + ' minutes of.'
 			FROM   #plan_stubs_warning p	;			
-			
+		
+		IF @v >= 11
+		BEGIN	
         IF EXISTS (SELECT 1/0
                    FROM   #trace_flags AS tf 
                    WHERE  tf.global_trace_flags IS NOT NULL
@@ -4094,6 +4096,7 @@ BEGIN
                     'You have Global Trace Flags enabled on your server',
                     'https://www.brentozar.com/blitz/trace-flags-enabled-globally/',
                     'You have the following Global Trace Flags enabled: ' + (SELECT TOP 1 tf.global_trace_flags FROM #trace_flags AS tf WHERE tf.global_trace_flags IS NOT NULL)) ;
+		END 
 
         IF NOT EXISTS (SELECT 1/0
 					   FROM   ##bou_BlitzCacheResults AS bcr