Manpages of gccgo-8 in Debian experimental

• aarch64-linux-gnu-go-8(1)
• aarch64-linux-gnu-gofmt-8(1)
• go-8(1)
• gofmt-8(1)
• powerpc-linux-gnu-go-8(1)
• powerpc-linux-gnu-gofmt-8(1)
• powerpc64le-linux-gnu-go-8(1)
• powerpc64le-linux-gnu-gofmt-8(1)
• x86_64-linux-gnu-go-8(1)
• x86_64-linux-gnu-gofmt-8(1)