As usual the source code structure has changed between the ESR versions
and this requires some adjustments for the overrides.

Small updates to the overrides rules for the thunderbird package as some
Lintian tags got renamed.

Update to upstream version '91.4.0'
with Debian dir e5b0529de8181ab4837d19c7c53df490cd9caece

Added patch:
debian-hacks/Fix-Floating-Point-Normalization-breakage-on-32bit-Linux.patch

Update to upstream version '91.3.2'
with Debian dir dd2b75f2efbe145ee3453f8902ae2fa751ff54df

Update to upstream version '91.3.0'
with Debian dir 8df53703065b2f3c4416409c70ebeee6b07e46dd

This reverts commit f935b529.
The newly added patch isn't working well and breaks soem other
architecture like arm64, ppc64el and s390x.

Thunderbird 91.x requires icu devlopment files around => 69.1 while
currently only 67.1 is available in unstable.
As we will never get a version 69.1 available in stable and oldstable
it's save now to use the preshipped icu files instead and disable a
configuratiion that searches for system wide installed packages.

Added patch:
debian-hacks/Fix-Floating-Point-Normalization-breakage-on-32bit-Linux.patch

Update to upstream version '91.2.1'
with Debian dir 3c553fb984f900318108e93e9cc4223bcf2a8e64

thunderbird Debian release 1:91.2.0-1

Update to upstream version '91.2.0'
with Debian dir 873256af68cd6850e8eb206680fc19b6304a315f

Removed patch (included upstream):
fixes/Bug-1727113-Never-require-that-addons-are-signed-for-Thun.patch

Update to upstream version '91.1.1'
with Debian dir 06d4c35f674ae561e79d292b40517ab42cd58dc1

Update to upstream version '78.14.0'
with Debian dir d5f0d05394f814566358576aab43e1b2191fa462

The x11-utils package is only required for providing the binary xmessage
which is used within the Icedove2Thunderbird migration wizard in case on
the system isn't the package kdialog or zenity installed.
So install this package only if the other two packages aren't present.

Closes: #993632

The build environment for Thunderbird is build by Python based wrapper
scripts that generate more or less classical configure script directly,
running autoreconf by the dh tools is quite useless and produces now
since autotools 2.71 the following error:

...
 debian/rules binary-arch
dh binary-arch
   dh_update_autotools_config -a
   dh_autoreconf -a
autoreconf: warning: autoconf input should be named 'configure.ac', not 'configure.in'
autoreconf: error: configure.in: AC_INIT not found; not an autoconf script?
dh_autoreconf: error: autoreconf -f -i returned exit code 1

We can ignore the target dh_autoreconf.

Closes: #993494
(cherry picked from commit 234c5666dbff28c338d69b3cc54254db3940c177)

The build environment for Thunderbird is build by Python based wrapper
scripts that generate more or less classical configure script directly,
running autoreconf by the dh tools is quite useless and produces now
since autotools 2.71 the following error:

...
 debian/rules binary-arch
dh binary-arch
   dh_update_autotools_config -a
   dh_autoreconf -a
autoreconf: warning: autoconf input should be named 'configure.ac', not 'configure.in'
autoreconf: error: configure.in: AC_INIT not found; not an autoconf script?
dh_autoreconf: error: autoreconf -f -i returned exit code 1

We can ignore the target dh_autoreconf.

Closes: #993494

Added patch:
fixes/Bug-1727113-Never-require-that-addons-are-signed-for-Thun.patch

Backport upstream fix about disabled installed official AddOns.
Closes: #993643

Modified patch:
porting-armhf/Bug-1526653-Include-struct-definitions-for-user_vfp-and-u.patch

Update to upstream version '91.1.0'
with Debian dir c7c598909dd1568aa99ca69457b9b7f9eaee7012

No further changes needed.