fix silly attempts to get rid of errors during compilation and put the missing import-package in place, otherwise it obviously cannot work

eclipse-language-servers/org.springframework.tooling.boot.ls/pom.xml

@@ -18,15 +18,6 @@
 	<build>
 		<plugins>
 
-			<plugin>
-				<groupId>org.eclipse.tycho</groupId>
-				<artifactId>tycho-compiler-plugin</artifactId>
-				<version>${tycho-version}</version>
-				<configuration>
-					<compilerArgument>-warn:+discouraged,forbidden</compilerArgument>
-				</configuration>
-			</plugin>
-
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-dependency-plugin</artifactId>
@@ -86,6 +77,7 @@
 			</plugin>
 
 		</plugins>
+
 	</build>
 
 </project>