Propagate the WITH_EXTENSION_INTEGRATION variable to build environment

set_soenv.in

@@ -1690,6 +1690,7 @@ ToFile( "ENABLE_REPORTBUILDER","@ENABLE_REPORTBUILDER@","e" );
 ToFile( "ENABLE_UNIX_QUICKSTARTER", "@ENABLE_UNIX_QUICKSTARTER@", "e" );
 ToFile( "SYSTEM_JFREEREPORT","@SYSTEM_JFREEREPORT@","e" );
 ToFile( "WITH_THEMES",       "@WITH_THEMES@",      "e");
+ToFile( "WITH_EXTENSION_INTEGRATION",       "@WITH_EXTENSION_INTEGRATION@",      "e");
 ToFile( "OOO_JUNIT_JAR",     "@OOO_JUNIT_JAR@",    "e" );
 ToFile( "SAC_JAR",           "@SAC_JAR@",          "e" );
 ToFile( "LIBXML_JAR",        "@LIBXML_JAR@",       "e" );