20.1.x release candidate testing

We don't plan to release 16.2.0 anytime soon, but its good to have such page to store notes of things which should be tested.

Notes from testing 16.1.3 are in #307 (closed) .

Test platforms:

• cygwin / gcc / x86-64
• msys / mingw32
• msys2 / mingw64
• msvc / vscc
• linux / gcc,clang / x86,x86-64,armv7h,arm64
• unix (freebsd, netbsd, openbsd) / gcc / x86-64
• android / gcc / armv7h,arm64
• ios / arm64
• haiku / gcc

What should be tested:

• internal tests (make check)
• ansi-tests
• cl-bench
• closer-mop tests
• maxima tests (important -- complex float support)
• cl-test-grid (last release vs release candidate)

Flag variations which should be used only on linux/gcc/x86-64 (other platforms are optional): --with-cxx=yes --with-cmp=no --enable-serialization --with-sse=yes --disable-threads --disable-unicode --disable-c99complex --disable-smallcons --with-dffi=no --with-fpe=no --with-ieee-fp=no

Before we start tests for real iOS branch should be merged. Then issue an email to mailing list to prompt people for testing on their platforms.