Reproducible BUILD_PATH_PREFIX_MAP

Make builds reproducible by honoring BUILD_PATH_PREFIX_MAP
Upstream has rejected the patch in this form and promised to implement an
alternative they are happy with instead. That hasn't happened yet though.

Bug: https://github.com/golang/go/issues/22491, https://github.com/golang/go/issues/16860
Forwarded: https://golang.org/cl/73291 (rejected upstream though)

Gbp-Pq: Name 0001-Reproducible-BUILD_PATH_PREFIX_MAP.patch

golang-1.11 (1.11.4-4) unstable; urgency=medium

  * Team upload.
  * Add patch "unix: fix Fstatat by using fillStat_t on linux/mips64x"
    This fixes the "Fstatat: returned stat does not match Stat/Lstat"
    errors detected by TestFstatat.
    See https://go-review.googlesource.com/c/sys/+/155747
  * Re-enable TestFstatat on mips64el

[dgit import unpatched golang-1.11 1.11.4-4]

Import golang-1.11_1.11.4-4.debian.tar.xz

[dgit import tarball golang-1.11 1.11.4-4 golang-1.11_1.11.4-4.debian.tar.xz]

Import golang-1.11_1.11.4.orig.tar.gz

[dgit import orig golang-1.11_1.11.4.orig.tar.gz]