Unofficial Release of icedtea-web-1.8.8-15-g1e9e65b06

This "release" is a build with the code base of the last 1.8.8 release plus three fixes.

• Fixed issue AdoptOpenJDK#782: Exception about duplicate class definition during start AdoptOpenJDK#856
• Fixed issue AdoptOpenJDK#826: Unexpected End of ZLIB Input Stream AdoptOpenJDK#884
• Fixed issue AdoptOpenJDK#691: properties from extension jnlp are not set AdoptOpenJDK#894

Full Changelog: icedtea-web-1.8.8...icedtea-web-1.8.8-15