maint: Remove functions deprecated in 3.8. * scripts/deprecated/module.mk: Remove deprecated scripts from build system. * scripts/deprecated/default_save_options.m, scripts/deprecated/gen_doc_cache.m, scripts/deprecated/interp1q.m, scripts/deprecated/isequalwithequalnans.m, scripts/deprecated/java_convert_matrix.m, scripts/deprecated/java_debug.m, scripts/deprecated/java_invoke.m, scripts/deprecated/java_new.m, scripts/deprecated/java_unsigned_conversion.m, scripts/deprecated/javafields.m, scripts/deprecated/javamethods.m, scripts/deprecated/re_read_readline_init_file.m, scripts/deprecated/read_readline_init_file.m, scripts/deprecated/saving_history.m: Remove scripts deprecated in 3.8 ahead of 4.2 release.

gnulib-hg = gnulib-hg