master updated (814e3b0 -> c86f3fe)

[Paul Eggert]

eggert pushed a change to branch master.

      from  814e3b0   EUDC: Add macOS Contacts backend
       new  0fc8671   Update from Gnulib
       new  5013065   Speed up GCC 10.1 compilation in default Git builds
       new  c8b6006   Use Gnulib libgmp module
       new  c86f3fe   Fix out-of-source ‘make check’ emacs-module-tests


Summary of changes:
 .gitignore                            |   1 +
 admin/merge-gnulib                    |   2 +-
 configure.ac                          |  59 +++-------
 lib/alloca.in.h                       |  15 ++-
 lib/dup2.c                            | 100 +++++------------
 lib/getrandom.c                       |   2 +-
 lib/gnulib.mk.in                      |  38 +++++--
 lib/{fpending.h => mini-gmp-gnulib.c} |  26 +++--
 {src => lib}/mini-gmp.c               | 144 +++++++++++++++---------
 {src => lib}/mini-gmp.h               |  10 +-
 lib/string.in.h                       |   5 -
 lib/sys_stat.in.h                     |  17 +++
 lib/unistd.in.h                       |   3 -
 m4/dup2.m4                            | 181 ++++++++++++++---------------
 m4/getrandom.m4                       |   6 +-
 m4/gnulib-comp.m4                     |  12 +-
 m4/lchmod.m4                          |   3 +-
 m4/libgmp.m4                          |  44 ++++++++
 m4/manywarnings.m4                    | 206 +++++-----------------------------
 m4/string_h.m4                        |   3 +-
 m4/sys_stat_h.m4                      |   8 +-
 m4/unistd_h.m4                        |   3 +-
 src/Makefile.in                       |   5 +-
 src/bignum.h                          |   7 +-
 src/mini-gmp-emacs.c                  |  32 ------
 test/Makefile.in                      |  11 +-
 test/data/emacs-module/mod-test.c     |   5 -
 test/src/emacs-module-tests.el        |   3 +
 28 files changed, 411 insertions(+), 540 deletions(-)
 copy lib/{fpending.h => mini-gmp-gnulib.c} (51%)
 rename {src => lib}/mini-gmp.c (97%)
 rename {src => lib}/mini-gmp.h (97%)
 create mode 100644 m4/libgmp.m4
 delete mode 100644 src/mini-gmp-emacs.c