[Picolibc] Version 1.8

[Keith Packard]

With the addition of nearly complete long double support in the math
library, it seems like it's time to declare a larger version increment
than usual.

 * Improve arc and xtensa support, adding TLS helpers and other build fixes

 * Fix FPSCR state for Arm8.1-M low overhead loops (thanks to David
   Green)

 * Add -Werror=double-promotion to default error set and fix related
   errors. (thanks to Ryan McClelland)

 * Fix locking bug in malloc out-of-memory path and freeing a locked
   mutex in the tinystdio bufio code. These were found with lock
   debugging code in Zephyr.

 * Add some missing functions in tinystdio, strto*l_l, remove,
   tmpname/tmpfile which were published in stdio.h but not included in
   the library.

 * Switch read/write functions to use POSIX types instead of legacy
   cygwin types. This makes mapping to existing an POSIX api work
   right.

 * Add %b support to tinystdio printf and scanf. These are disabled by
   default as they aren't yet standardized.

 * Fix avr math function support. The avr version of gcc has modes
   where double and long double are 32 or 64 bits, so the math library
   code now detects all of that at compile time rather than build time
   and reconfigures the functions to match the compiler types.

 * Add nearly complete long double support from openlibm for 80-bit
   Intel and 128-bit IEEE values (in addition to supporting 64-bit
   long doubles). Still missing are Bessel functions and decimal
   printf/scanf support.

 * Add limited long double support for IBM 'double double' form. This
   is enough to run some simple tests, but doesn't have any
   significant math functions yet.

 * Get Power9 code running under qemu with OPAL. This was mostly
   needed to validate the big-endian and exception code for 128-bit
   long doubles, but was also used to validate the double double
   support.

 * Provide times() and sysconf() implementations in semihosting. You
   can now build and run the dhrystone benchmark without any further
   code.

 * Fix use of TLS variables with stricter alignment requirements in
   the default linker script and startup code. (thanks to Joakim
   Nohlgård and Alexander Richardson who found this issue while
   working on lld support).

-- 
-keith
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