fix(linux): Exclude s390x from package builds

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