warning clean-up

[Jim Meyering]

I've just pushed a bunch of changes:

Here's a summary:

[PATCH 01/10] build: "make stable" emitted an invalid gnupload command
[PATCH 02/10] maint: cfg.mk: remove factored-out ftp host/dir definitions
[PATCH 03/10] maint: tweak formatting of bootstrap.conf
[PATCH 04/10] build: enable many warnings
[PATCH 05/10] build: use gnulib's fdopendir module
[PATCH 06/10] build: avoid warnings from -Wstrict-prototypes
[PATCH 07/10] build: avoid many const-related warnings
[PATCH 08/10] build: util.c: avoid warnings about add_envopt
[PATCH 09/10] build: avoid warnings about unused macros
[PATCH 10/10] build: unlzw.c: avoid warnings about unused macros


 Makefile.am      |    2 -
 b/Makefile.am    |    1
 b/README-release |    2 -
 b/bootstrap.conf |   59 ++++++++++++++++++--------------------
 b/cfg.mk         |    5 +--
 b/configure.ac   |   84 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 b/deflate.c      |    5 ---
 b/gnulib         |    3 -
 b/gzip.c         |    7 ----
 b/gzip.h         |    6 +--
 b/lib/.gitignore |   37 ++++++++++++++++++++++++
 b/m4/.gitignore  |    3 +
 b/unzip.c        |    3 -
 b/util.c         |   15 +++------
 bootstrap.conf   |    4 +-
 cfg.mk           |   10 ------
 configure.ac     |    5 +--
 gzip.c           |   32 +++++++++-----------
 m4/.gitignore    |   22 +++++++++++++-
 util.c           |   18 +++++------
 20 files changed, 218 insertions(+), 105 deletions(-)