javacomp-script, javacomp: Silence javac warnings regarding [options]. * m4/javacomp.m4 (gt_JAVACOMP): Use option '-Xlint:-options' by default and omit it only when it does not work. * lib/javacomp.c (compile_using_javac): Add nowarn_option parameter. (is_envjavac_usable): Add nowarn_option_out parameter. Use option '-Xlint:-options' by default and omit it only when it does not work. (is_javac_usable): Likewise. (compile_java_class): Store the nowarn_option returned from is_envjavac_usable and use it when invoking compile_using_envjavac. Store the nowarn_option returned from is_javac_usable and use it when invoking compile_using_javac.