Bug#881621: gcc-6: biarch32archs typo: r6->r2

[YunQiang Su <wzssyqa@gmail.com>]

Package: src:gcc-6
Version: 6.4.0-10

My patch of #881575 has a typo in debian/rules.defs

biarch32archs :=
/amd64/ppc64/kfreebsd-amd64/s390x/sparc64/x32/mipsn32/mipsn32el/mips64/mips64el/mipsn32r2/mipsn32r2el/mips64r2/mips64r2el/

here

/mipsn32r2/mipsn32r2el/mips64r2/mips64r2el/
should be
/mipsn32r6/mipsn32r6el/mips64r6/mips64r6el/

-- 
YunQiang Su