docs: deprecate JAVA primary * doc/automake.texi (Java): Deprecate the JAVA primary, stating that it will become obsolete in automake 1.12 and probably removed altogether in automake 1.13. Reflect this in the section title, by appending the string "(deprecated feature)". (@menu, @detailmenu): Update. (Java Support with gcj): The cross-referenced support for bytecode compilation with the JAVA primary is rudimentary and deprecated. State that explicitly.