run.bat/.sh should allow loading native libraries from bin/native, if it exists

REM Add bin/native to the PATH if present
if exist "%JBOSS_HOME%\bin\native" set PATH=%JBOSS_HOME%\bin\native;%PATH%
if exist "%JBOSS_HOME%\bin\native" set JAVA_OPTS=%JAVA_OPTS% -Djava.library.path=%JBOSS_HOME%\bin\native