explicit casts for MSVC

extern C on jl_sysimage_name

increase stack size when linking
attempt to get setjmp and longjmp assembly working in MSVC

add .586 to assembly files for masm
MSVC: disable shared libuv library,

extern C on timefuncs, disable sys.dll
use alloca instead of VLA
add getopt.{c,h} from musl-libc for MSVC use

link to license of musl-libc
change .do extension to .dbg.obj

so the compile MSVC wrapper script can recognize the extension
use msvcr120.dll instead of msvcrt.dll for MSVC build

prevent untested MSVC versions from compiling
commit msys_build.sh for reusing dependencies from nightlies
add -DMOJIBAKE_EXPORTS flag when building libmojibake

and when linking flisp
bump mojibake submodule for dllexport fix
replace hex floats with equivalent decimal values