Ubuntu 18.04 Bionic only contains Meson 0.45. The build seems
to work with that version, so we partially revert the previous
change that set the minimum version to 0.50.
s390x is big-endian which we currently don't support (#5111).
Only build on architectures supported by Debian. This excludes the
following little-endian architectures:
alpha arm ia64 riscv64 sh4 x32 arm64ilp32 mipsn32el
and the following big-endian ones:
avr32 hppa m68k mips mips64 mipsn32 powerpc ppc64 s390 sparc sparc64
See https://wiki.debian.org/SupportedArchitectures
and https://wiki.debian.org/ArchitectureSpecificsMemo
This is a cherry-pick of PR#4223:
- Add script to create debian source package
- Update debian metadata based on Debian repos
- Remove some lintian warnings and errors
- Remove support Xenial
- Reduce size of icon
- Omit confusing values from gbp.conf
