Remove unused 3rd party jars in tests (#4843)

- Remove unused 3rd party jars in tests

Signed-off-by: LongyuZhang <[email protected]>

Author: LongyuZhang

openjdk/build.xml

@@ -54,20 +54,6 @@
 				<property name="jtregTar" value="jtreg_6_1"/>
 			</then>
 		</elseif>
-		<elseif>
-			<!-- versions 18, 19 -->
-			<matches pattern="^1[89]$" string="${JDK_VERSION}"/>
-			<then>
-				<property name="jtregTar" value="jtreg_6_1_1"/>
-			</then>
-		</elseif>
-		<elseif>
-			<!-- version 20 -->
-			<matches pattern="^20$" string="${JDK_VERSION}"/>
-			<then>
-				<property name="jtregTar" value="jtreg_7_1_1_1"/>
-			</then>
-		</elseif>
 		<elseif>
 			<!-- version 21, 22 -->
 			<matches pattern="^2[12]$" string="${JDK_VERSION}"/>