Update after gnulib changed.
* gettext-tools/src/msgexec.c (process_string): Update create_pipe_out
invocation.
* gettext-tools/src/write-resources.c (execute_writing_input): Likewise.
* gettext-tools/src/msginit.c (project_id, project_id_version, get_user_email,
language_team_address, plural_forms): Update create_pipe_in invocations.
* gettext-tools/src/read-csharp.c (execute_and_read_po_output): Likewise.
* gettext-tools/src/read-java.c (execute_and_read_po_output): Likewise.
* gettext-tools/src/read-resources.c (execute_and_read_po_output): Likewise.
* gettext-tools/src/read-tcl.c (msgdomain_read_tcl): Likewise.
* gettext-tools/src/x-ruby.c (extract_ruby): Likewise.
* gettext-tools/src/urlget.c (execute_it, fetch): Update execute invocations.
