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community/picolibc: fix deps, fix build, upgrade to 1.8.2

Marian Buschsieweke requested to merge maribu/aports:community/picolibc-fix into master

This contains two commits:

community/picolibc: fix deps and rebuild against gcc

Sadly, picolibc depends on the exact version of the embedded GCC cross compiler it was build with, as it installs its specs into /usr/lib/gcc/$target_triple/$gcc_ver/picolibc.specs.

In order to shoot myself in the foot again next time I bump GCC, the dependency on GCC now is nailed to the version picolibc was build with.

Finally, CFLAGS and LDFLAGS are cleared prior building, as the host system flags (for a full Linux OS system) are not all compatible with the target (tiny bare metal MCU).

community/picolibc: upgrade to 1.8.2

While we're at it, we can also bump the version. But this should be a separate commit so that we can revert more fine-grained.

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