There are (broken) compilers out there that accept -fstack-protector-*
parameters, but do not provide the needed ssp library. As a result,
build does not fail, but link does. Use the local check_link_flag
autoconf function to correctly test for SSP availability.

Required for the Imagination Technologies Codescape IMG MIPS
toolchain, version 2015.10 (and who knows what else).

Fixes #744.

This should resolve mobile-shell/mosh#675

Found by OpenBSD build.

* A resize action could be applied to the framebuffer but discarded
  before being applied to termios, causing them to be out of sync.

* Only every second action was skipped, instead of skipping
  consecutive resize actions, as intended.

Found by inspection, not seen in actual usage or by the window-resize
test.

This is an alternate way to resolve #417 without affecting
backward compatibility.

Add --family=auto/all.
Attempt connects to all available addresses.
Working error handling.

Fixes #629.

protobuf uses an obsolete automake pthreads detection macro,
which results in "pkgconfig --libs protobuf" returning
"-lprotobuf -pthread -lpthread" on Linux.  Remove
the unnecessary and dangerous -lpthread in that case.

Fixes #727, mosh-server crash in libutempter on Debian Sid.

This field was used during development to measure the
coverage of the ANSI terminal parser against typical
terminal input sequences.

The "handled" field has not been read by any code since
commit 1ee54cd7 (February 2011). Eliminating the field
by popular request (closes #723).

Signed-off-by: Anders Kaseorg <andersk@mit.edu>

Signed-off-by: Anders Kaseorg <andersk@mit.edu>

By informing Debhelper that the mosh wrapper script only uses modules in
perl-base (dh_perl -d), we cause ${perl:Depends} to change from ‘perl’
to empty, which silences this build warning:

dpkg-gencontrol: warning: package mosh: unused substitution variable ${perl:Depends}

Signed-off-by: Anders Kaseorg <andersk@mit.edu>

That is already added by dh_installdeb, so it was being added twice.

Signed-off-by: Anders Kaseorg <andersk@mit.edu>

Non-blocking reads turn out not to work so well on Cygwin
which has an older version of bash.

Resolves #705.

Fixes #702.

Resolves #539.

Fixes #692.