[Picolibc] Version 1.7.8

[Keith Packard]

### Picolibc version 1.7.8

 1. Fix el/ix level 4 code type errors

 2. Fix out-of-source CMake build (thanks Max Behensky)

 3. Improve build.md docs (thanks Kalle Raiskila)

 4. Fix cmake build for various architectures

 5. Initialize lock in fdopen

 6. Remove %M from linker paths in single-arch builds

 7. Shrink tinystdio vfprintf and vfscanf a bit

 8. Use -fno-builtin-malloc -fno-builtin-free (GCC 12 compat)

 9. Use -fno-builtin-copysignl (GCC 12 compat)

 10. Add _zicsr to -march for risc-v picocrt (binutils 2.38 compat)

 11. Add -no-warn-rwx-segments to link spec (binutils 2.38 compat)

-- 
-keith
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