SONARPLUGINS-1583 Trailing slash on Windows XP prevent Sonar Runner to run

src/main/assembly/bin/sonar-runner.bat

@@ -21,9 +21,12 @@ echo.
 goto end
 
 :OkJavaHome
-if NOT "%SONAR_RUNNER_HOME%"=="" goto run
-set SONAR_RUNNER_HOME=%~dp0..
-
+if NOT "%SONAR_RUNNER_HOME%"=="" (
+  @REM If the property has a trailing backslash, remove it
+  if %SONAR_RUNNER_HOME:~-1%==\ set SONAR_RUNNER_HOME=%SONAR_RUNNER_HOME:~0,-1%
+) else (
+  set SONAR_RUNNER_HOME=%~dp0..
+)
 
 @REM ==== START RUN ====
 :run