spawn-pipe: Allow caller to specify directory for the subprocess. * lib/spawn-pipe.h (create_pipe_out, create_pipe_in, create_pipe_bidi): Add directory argument. * lib/spawn-pipe.c: Include canonicalize.h, filename.h, findprog.h. (create_pipe): Add directory argument. If specified, resolve the program file name and make it absolute, first. Pass the directory to spawnpvech and posix_spawn_file_actions_addchdir. (create_pipe_bidi, create_pipe_in, create_pipe_out): Add directory argument. * modules/spawn-pipe (Depends-on): Add canonicalize, filename, findprog-in, posix_spawn, posix_spawn_file_actions_addchdir. * tests/test-spawn-pipe-main.c (test_pipe): Update. * NEWS: Mention the change. * lib/csharpcomp.c (compile_csharp_using_mono, compile_csharp_using_sscli): Update. * lib/javacomp.c (is_envjavac_gcj, is_envjavac_gcj43, is_gcj_present, is_gcj_43): Update. * lib/javaversion.c (execute_and_read_line): Update. * lib/pipe-filter-gi.c (pipe_filter_gi_create): Update. * lib/pipe-filter-ii.c (pipe_filter_ii_execute): Update.