Bug#1088269: sbuild 0.87.1 fails on build dependencies missing from the host system

[Martin Dosch]

Package: sbuild
Version: 0.87.1
Followup-For: Bug #1088269

Dear Maintainer,

I am also suffering from this bug. Downgrading sbuild to 0.87.0 from 
testing fixes it.

```
gbp buildpackage -v --source-on
ly                                                                              
                                      
gbp:info: Performing the build
dpkg-buildpackage: info: source package golang-github-protonmail-gopenpgp-v3
dpkg-buildpackage: info: source version 3.1.0-2
dpkg-buildpackage: info: source distribution unstable
dpkg-buildpackage: info: source changed by Martin Dosch <mar...@mdosch.de>
dpkg-checkbuilddeps: error: Unmet build dependencies: 
golang-github-pkg-errors-dev golang-github-protonmail-go-crypto-dev (>= 1.1.0~) 
golang-github-protonmail-go-mime-dev golang-github-stretchr-testify-dev
dpkg-buildpackage: warning: build dependencies/conflicts unsatisfied; aborting
dpkg-buildpackage: warning: (Use -d flag to override.)
E: Failed to clean source directory 
/home/martin/build/deb/golang-packaging/golang-github-protonmail-gopenpgp-v3 
(/home/martin/build/deb/golang-packaging/golang-github-protonmail-gopenpgp-v3_3.1.0-2.dsc)
gbp:error: 'sbuild -v --source-only' failed: it exited with 1
```

So to workaround this bug I have to either disable clean up or not use 
build-depends, do I understand this correct?

Maybe add `$clean_source=0;` by default to not break build systems with 
the update?

Best regards,
Martin

-- System Information:
Debian Release: trixie/sid
  APT prefers testing
  APT policy: (900, 'testing'), (600, 'unstable'), (500, 'unstable-debug'), 
(500, 'testing-debug'), (500, 'experimental'), (1, 'experimental-debug')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.11.10-amd64 (SMP w/8 CPU threads; PREEMPT)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages sbuild depends on:
ii  adduser         3.137
ii  libsbuild-perl  0.87.1
ii  perl            5.40.0-8

Versions of packages sbuild recommends:
ii  autopkgtest  5.42
ii  debootstrap  1.0.137
ii  mmdebstrap   1.5.4-2
ii  schroot      1.6.13-5
ii  uidmap       1:4.16.0-5

Versions of packages sbuild suggests:
pn  deborphan  <none>
ii  e2fsprogs  1.47.1-1+b1
ii  kmod       33+20240816-2
ii  wget       1.24.5-2+b1

-- no debconf information

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