Make configure pass with jdk9

[Fridrich Strba]

Hello,

With the attached patch, the configure passes when the jdk used is jdk9.
We are using from the X509Factory only two strings, so I replaced the
BEGIN_CERT and END_CERT with the actual string content and removed the
check for sun.security.provider.X509Factory.

With this patch the current icedtea-web head builds with
--enable-native-plugin against jdk9. The only thing that has to be
disabled for the while is javadoc documentation, since without
--disable-docs, the build produces errors like this:

icedtea-web/netx/net/sourceforge/jnlp/runtime/ApplicationInstance.java:30:
error: package sun.awt is not visible
import sun.awt.AppContext;
          ^
  (package sun.awt is declared in module java.desktop, which does not
export it to the unnamed module)

Which should be fixable by a battery of --add-exports.

Cheers

Fridrich
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