Bug#1061250: gjs FTCBFS: cxx.run always fails cross compilation

[Helmut Grohne]

Source: gjs
Version: 1.78.2-2
Tags: patch upstream
User: debian-cross at lists.debian.org
Usertags: ftcbfs

gjs fails to cross build from source, because meson.build uses
cxx.run().  While meson.build also considers a failure from cxx.run()
with a warning when cross compiling, that code never goes into effect,
because cxx.run() aborts meson execution during cross compilation. I'm
proposing the attached patch to skip cxx.run() when cross compiling
(with the previous warning). This allows the build to continue until it
runs into #1060838, which hopefully is to be fixed elsewhere.

Helmut
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