Bug#923131:
Do you have tzdata installed? I'm not sure why you'd do this vs just taking the source from golang.org/dl to be honest.
Bug#923131: golang-1.11-src: errors when building the go compiler from golang-1.11-src package sources (1.11.5-1)
Package: golang-1.11-src Version: 1.11.5-1 Severity: normal -- System Information: Debian Release: buster/sid APT prefers unstable APT policy: (500, 'unstable') Architecture: amd64 (x86_64) Kernel: Linux 4.9.0-8-amd64 (SMP w/8 CPU cores) Locale: LANG=ru_RU.utf8, LC_CTYPE=ru_RU.utf8 (charmap=U