cpuminer-opt-25.2

ARM: Fixed regression from v25.1 that could cause build fail.
BSD: FreeBSD is now supported. Other BSDs may also work.
MacOS: build with installed jansson library instead of compiling the included source code.
Windows: remove "_WIN32_WINNT=0x0601" which is a downgrade on Win11.
Changed build.sh shell from bash to sh.

This should be the last new release for a while unless something comes up. Support has been expanded to
MacOS and FreeBSD operating systems on both x86_64 & ARM64 CPU architectures. Other BSDs may also work but
have not been tested. Unfortunately Windows on ARM64 is still a work in progress.

The build process has also been streamlined and tweaked over the past few releases. Once all the packages are installed
for the specific environment a single command will build cpuminer-opt. The Wiki has also been updated to reflect these changes.