[Picolibc] Version 1.7.4

[Keith Packard]

Thanks much to Yasushi Shoji for reworking the github actions to speed
up builds!

### Picolibc version 1.7.4

 1. Clean up meson build bits, including use of 'fs module (thanks to
    Yasushi Shoji).

 2. Speed up github actions by sharing Debian docker image (thanks to
    Yasushi Shoji).

 3. Reduce use of intermediate static libraries during build

 4. Use standard Meson architecture names everywhere (thanks to
    Yasushi Shoji).

 5. Support building with -D_FORTIFY_SOURCE enabled.

 6. Clean up 32-bit arm assembly code, eliminating __aeabi wrappers
    where possible.

 7. Add basename, dirname and fnmatch back.

 8. Fix all old-style (K&R) function definitions.

 9. Enable lots more compiler warning flags.

 10. Remove last uses of alloca in legacy stdio code.

 11. Add tests from musl libc-testsuite. There aren't many tests, but
     these identified a few bugs.

 12. Add lots more exception and errno tests for the math functions.

 13. Restructure math library to always use the __math_err functions
     to raise exceptions and set errno. This removes the w_*.c wrapper
     functions and eliminates the __ieee names. This centralizes
     compiler work-arounds to ensure run-time evaluation of
     expressions intended to raise exceptions. In the process, all of
     the libm/math files were reformatted with clang-format.

 14. Make tinystdio '%a' compatible with glibc, including supporting
     rounding and trimming trailing zeros when possible.

 15. Remove floating point exception generation code on targets
     without floating point exception support. This reduces code size
     on soft float machines without affecting results.

-- 
-keith
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