[Libguestfs] src/ is now warning-free, too

[Jim Meyering]

These patches first make src/ warning free, and then
turn on the strict warning options.

   75 0001-build-suppress-an-ignored-write-return-value-warning.patch
   38 0002-build-suppress-an-ignored-dup-return-value-warning.patch
   27 0003-generator.ml-suppress-signed-unsigned-compare-warnin.patch
   48 0004-build-don-t-perform-arithmetic-on-void-pointers.patch
   30 0005-suppress-signed-unsigned-comparison-warnings.patch
   28 0006-suppress-a-warning-from-Wswitch-default.patch
   36 0007-suppress-warnings-from-Wmissing-noreturn.patch
  102 0008-build-new-configure-time-option-enable-gcc-warnings.patch

$ diffstat 000*
 b/bootstrap        |    1
 b/configure.ac     |   61 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 b/src/Makefile.am  |    4 ++-
 b/src/generator.ml |    3 --
 b/src/guestfs.c    |    4 +--
 src/Makefile.am    |    5 ++--
 src/guestfs.c      |   32 +++++++++++++++++----------
 7 files changed, 91 insertions(+), 19 deletions(-)