Add java loader to the loaders include list.
#cmakedefine OPTION_BUILD_LOADERS_CS 1
#cmakedefine OPTION_BUILD_LOADERS_DART 1
#cmakedefine OPTION_BUILD_LOADERS_FILE 1
+#cmakedefine OPTION_BUILD_LOADERS_JAVA 1
#cmakedefine OPTION_BUILD_LOADERS_JSM 1
#cmakedefine OPTION_BUILD_LOADERS_JS 1
#cmakedefine OPTION_BUILD_LOADERS_LUA 1
