v2018.12.0

Michael Olbrich (41):
      cross-binutils: improve search paths
      build_all_v2.mk: don't overwrite existing PTXDIST_ENV_WHITELIST
      ptxconfig: don't use a subdirectory for newlib toolchains
      cleanup: make it possible to not strip the target binaries
      debian: improve debian packaging
      ptxconfig: update after deb pkg removal
      rules: remove old unused mingw stuff
      ptxconfig: update after deb mingw removal
      fixup_ptxconfigs.sh: support gcc-8.x
      gcc: version bump 7.3.1 (7-20180201) -> 8.2.1 (8-20181130)
      glibc: version bump 2.27 -> 2.28
      kernel-headers: version bump 4.15 -> 4.19
      binutils: version bump 2.30 -> 2.31.1
      fixup_ptxconfigs.sh: use gdb-8.2
      gdb: version bump 8.1 -> 8.2
      kernel-headers: fix building with newer kernel headers
      host-expat: version bump 2.2.5 -> 2.2.6
      host-isl: version bump 0.18 -> 0.20
      host-libelf: version bump 0.170 -> 0.174
      host-mpfr: version bump 4.0.0 -> 4.0.1
      host-xz: version bump 5.2.3 -> 5.2.4
      kernel-headers: pick a explicit defconfig for ppc
      newlib: add support for download version
      newlib: version bump 2.5.0 -> 3.0.0 (3.0.0.20180831)
      uclibc-ng: version bump 1.0.28 -> 1.0.31
      ptxconfig: update after adding riscv
      fixup_ptxconfigs.sh: switch to ptxdist-2018.12.0
      ptxconfigs: update for ptxdist-2018.12.0
      fixup_ptxconfigs.sh: add support for big-endian mips
      ptxconfigs: add big-endian mips toolchain
      cross-gcc/cross-binutils/cross-gdb: more debug data
      make_release: add more sanity checks
      platforms: add local Kconfig
      cross-gdb: add missing dependency
      fixup_ptxconfigs.sh: add license data for new versions with new SPDX identifier
      ptxconfigs: update license data
      Kconfig: add and enable PROJECT_CHECK_LICENSES
      ptxconfig: update after adding PROJECT_CHECK_LICENSES
      rules: update license identifier to latest SPDX version
      debian: allow python3.7-dev
      release 2018.12.0

Rouven Czerwinski (3):
      architecture: add RISCV64
      fixup_ptxconfigs: add riscv64 architecture
      ptxconfigs: add riscv64 toolchain

Uwe Kleine-König (2):
      build_one: Fix typo
      debian: complete overhaul of debian package generation
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