Bug#839095: llvm-toolchain-3.9: Vcs-* links point to 3.8

[Rebecca N. Palmer]

Source: llvm-toolchain-3.9
Version: 1:3.9-1
Severity: minor
Control: tags -1 patch
The Vcs-* links in debian/control both point to 
pkg-llvm/llvm-toolchain/branches/3.8/ , not 3.9.