[Pkg-xmpp-devel] Bug#1109963: d/rules: use DEB_BUILD_OPTION_PARALLEL instead of nproc to respect Debian Policy 4.9.1

[Michael R. Crusoe]

Source: swift-im
Version: 5.0~alpha2.145.g12d031cf8+dfsg-4.1
Severity: normal
Tags: patch
X-Debbugs-Cc: crusoe at debian.org

Dear maintainers,

Please consider my patch at https://salsa.debian.org/xmpp-team/swift-im/-/merge_requests/2 for using DEB_BUILD_OPTION_PARALLEL instead of nproc to respect Debian Policy 4.9.1 [0]

> `parallel=n`
>
>    This tag means that the package should be built using up to n parallel processes 

Using `nproc` ignores the value of `parallel` that may be set in DEB_BUILD_OPTIONS.

The patch at the merge request above replaces the call to `nproc` and will also fix the Lintian warning "source: debian-rules-calls-nproc".

[0] https://www.debian.org/doc/debian-policy/ch-source.html#debian-rules-and-deb-build-options
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