[Bug bootstrap/81926] go/parse.o differs between stage2 and stage3

[dclarke at blastwave dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81926

--- Comment #19 from Dennis Clarke <dclarke at blastwave dot org> ---

Regarding "BUILD_CONFIG" I have about ten log files and they all say : 

checking for default BUILD_CONFIG... 

I have never set that var to anything.