USE_FIXEDPOINT needs CI coverage

USE_FIXEDPOINT seems to lack CI coverage, and is therefore breaking step by step. Known issues in OpenEmbedded are:

https://git.openembedded.org/meta-openembedded/tree/meta-oe/recipes-support/poppler/poppler/0002-CairoOutputDev.cc-fix-build-error-when-using-fixedpo.patch
http://lists.openembedded.org/pipermail/openembedded-devel/2019-August/201265.html

USE_FIXEDPOINT needs CI coverage to catch such issues before they hit releases. Or removal if it is no longer considered worth the effort - the Debian armel port already uses the FPU emulation for poppler, and older ARM CPUs without VFP no longer have many usecases where PDF performance matters much.

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