There is no dependency on old GTK-2 stuff any more.

We need to increase the required versions for NSPR, NSS, libicu-dev and
rustc.

Update to upstream version '91.0~b1'
with Debian dir 3688beffad17cdf1af6fb9bfa63fa175cc7ecd0b

GTK2 stuff is now really obsolete, nothing to install any more.

Just a formal correction for the previous commit. Enclose variables
within {} signs.

(cherry picked from commit 07fb6efb)

Running `thunderbird -g` produces the following error:

    INFO  -> Starting Thunderbird with GDB ...
    INFO  -> LANG= /usr/bin/gdb -ex "handle SIG38 nostop" -ex "handle SIGPIPE nostop" -ex "run" /usr/lib/thunderbird/thunderbird
    /usr/bin/thunderbird: line 254: /usr/bin/gdb -ex "handle SIG38 nostop" -ex "handle SIGPIPE nostop" -ex "run" /usr/lib/thunderbird/thunderbird : No such file or directory

This occurs because exec is passed a single argument, which it
interprets as a file name that does not exist.  Instead, use the
following steps:

1. Build a command string which combines ${TB_GDB_DEFAULT_OPTS} and
   ${TB_ARGS[@]} (using `printf ' %q'`).
2. Print the command string with output_info.
3. Run it using `eval` (for word splitting) and `exec` (to replace the
   shell process with gdb, as before).

Signed-off-by: Kevin Locke <kevin@kevinlocke.name>
(cherry picked from commit d003e26e)

We need to escape the arguments for the -ex option while calling gdb.

Closes: #976979
(cherry picked from commit 16a7ab75)

Rework of the man page as especially the debug call has changed for
while and this wasn't put into modifying thunderbird(1).

(cherry picked from commit 241e5393)

removed patch (temporarly)
fixes/reduce-the-rust-debuginfo-level-on-selected-architectures.patch

removed patch (obsolet due removed code):
debian-hacks/Work-around-Debian-bug-844357.patch

Update to upstream version '90.0~b2'
with Debian dir 9b6da5bacba5029e5718824e3e2adc027dab325a

modified patches:
debian-hacks/Don-t-register-plugins-if-the-MOZILLA_DISABLE_PLUGIN.patch
porting-armhf/Don-t-use-LLVM-internal-assembler-on-armhf.patch
porting-kfreebsd-hurd/FTBFS-hurd-fixing-unsupported-platform-Hurd.patch

removed patches:
debian-hacks/Don-t-register-plugins-if-the-MOZILLA_DISABLE_PLUGIN.patch

Update to upstream version '89.0~b2'
with Debian dir 042d025181020dbd48c4643105a57df988de0d42

There is a new build dependency on the nasm package.

The lower case variant "thunderbird" is always used within
StartupWMClass in contrary to the upper case string "Thunderbird" which
is only available in some window managers.
Adjust the setting within the dekstop file so we announce the always
available string.

Closes: #985366
(cherry picked from commit 7d454de6)

modified patch:
debian-hacks/Add-another-preferences-directory-for-applications-p.patch
porting-armhf/Don-t-use-LLVM-internal-assembler-on-armhf.patch

removed patches (included upstream):
porting-arm/Reduce-memory-usage-while-linking-on-arm-el-hf-platforms.patch
porting-s390x/Explicitly-instantiate-TIntermTraverser-traverse-TIntermN.patch

renamed patch:
fixes/Load-dependent-libraries-with-their-real-path-to-avo.patch ->
 fixes/Load-dependent-libraries-with-their-real-path.patch

Update to upstream version '88.0~b2'
with Debian dir 4c9f78f85cd0cea83ecd971fcbe5c6262d0c4073

The application icon is already installed in various sizes in the
global hicolor icon theme; hence, there is no need to provide a symlink
to it also in the legacy pixmaps location.

(cherry picked from commit f2f1f3f2)

We don't need to list the source for modules/libpref/init/all.js any
more.

Adjust the path for TeXZilla.js as it has moved within the source tree.

modified patch:
debian/patches/porting-kfreebsd-hurd/adding-missed-HURD-adoptions.patch

Update to upstream version '86.0~b3'
with Debian dir cf8eb6bfd7988451651b549cf86b224be2fd21f8