SLING-6502 JSP: java.lang.VerifyError (Bad type on operand stack)

tie package imports of JSP and EL API to version 2.1.0

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1786606 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index d5f9ae3..2edaeab 100644
--- a/pom.xml
+++ b/pom.xml
@@ -48,6 +48,11 @@
                 <extensions>true</extensions>
                 <configuration>
                     <instructions>
+                        <Import-Package>
+                            javax.el;version="[2.1.0,2.1.0]",
+                            javax.servlet.jsp.*;version="[2.1.0,2.1.0]",
+                            *
+                        </Import-Package>
                         <Export-Package>
                             org.apache.sling.scripting.jsp.util;version=2.0.8
                         </Export-Package>