Bug#884774: glibc: add mips r6 architectures into the list of gcc-6-multilib dep

[YunQiang Su]

Package: src:glibc
Version: 2.25-5

Since current mips r6 architectures are multilibed.
Please add
    mipsr6 mipsr6el mipsn32r6 mipsn32r6el mips64r6 mips64r6el
into the list of list of depending gcc-6-multilib.

-- 
YunQiang Su