Bug#1121760: gcc-bpf: Version calculation goes wrong after binNMU

[Adrian Bunk]

Source: gcc-bpf
Version: 17
Severity: normal

After the 17+b1 binNMU:
gcc-bpf    | 14.3.0-10+    | unstable        | amd64, arm64, armhf, i386, 
ppc64el, riscv64, s390x

Not trying to substract 15 from deb_release fixes this,
and results in version 14.3.0-10+17+b1.