[Picolibc] Version 1.7.6

[Keith Packard]

I discovered the Debian packages for 1.7.5 were built incorrectly due to
mis-understanding how meson processes command line options and
cross-file configurations. That led to some significant evaluation of
the picolibc build system and some minor changes to avoid this in the
future.

### Picolibc version 1.7.6

 1. Fix use with C++ applications caused by a syntax error in
    picolibc.specs

 2. Automatically include '-nostdlib' to options used while
    evaluating build rules to ensure tests work as expected.

 3. Publish aarch64 inline math functions, ensure that inline fma
    functions work in installed applications for arm and risc-v.

-- 
-keith
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