* Enable better support for alternative architectures:
  - 0001-SERVER-12064-Atomic-operations-for-gcc-non-Intel-arc.patch
    0002-SERVER-12065-Support-ARM-and-AArch64-builds.patch
    0003-SERVER-12064-Use-gcc-atomic-builtins-if-available.patch:
    Cherry picked changes from Robie Basak to enable atomic operations
    on non-Intel architectures.
  - 0004-Support-ppc64el-builds.patch: Add support for detection of
    powerpc64 as a 64-bit platform.
  - d/control: Enable arm64 and ppc64el architectures.