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build: clean up arm build options

Rodrigo Muino Tomonari requested to merge github/fork/bnoordhuis/fix30786 into master

  • default to -march=armv7-a+neon-vfp3 when targeting armv7. Any Cortex-A capable of running V8 supports at least that.

  • remove the --arm-fpu=... configure option. It was added to support Debian's armel port (armv5, for the purpose of this discussion) but V8 (and therefore Node.js) dropped support for armv5 in early 2016.

  • remove the --arm-float-abi=... configure option. There should never be a reason to build in soft or softp mode; armv6 is the bare minimum and supports VFP.

Fixes: https://github.com/nodejs/node/issues/30786

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