rebuild patch queue from patch-queue branch

Patches provided by John Paul Adrian Glaubitz to fix existings FTBFS
issues on platforms sparc64 and mk68, Thanks!

added patches:
porting-mk68/Add-m68k-support-to-Thunderbird.patch
porting-sparc64/Add-sparc64-support-to-Thunderbird.patch

Closes: #859151, #859271