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meson: fix subproject build regression

Tim-Philipp Müller requested to merge tpm/fontconfig:meson-fix-subproject-build into master

commit ae9ac2a1 from !165 (merged) introduced a regression when fontconfig is built as a subproject. In that case we would fail to correctly construct the path to the root build dir where the meson-info subdirectory resides, instead looking for it in the fontconfig subproject subdir. This would result in FAILED: subprojects/fontconfig/src/fcobjshash.gperf errors in the cutout.py script.

Instead use the @BUILD_ROOT@ substitution to get to the build root which will work correctly in either scenario.

(This is currently not documented in Meson but will be documented once https://github.com/mesonbuild/meson/pull/8363/ lands. Was tested with 0.56.1.)

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