In QB64, when linking with an external static library `nm.exe` is used
to determine whether the symbol being used is either a C or C++ symbol,
which determines how the function should be declared in the C++ code.
Unfortunately on Windows the `SHELL` command for `nm.exe` is missing the
`cmd /c`, which means the redirection does not work and consequently
we're unable to find the function declaration via `nm.exe`, which causes
the compilation to fail.
In addition to fixing this, I added tests for `DECLARE STATIC LIBRARY`
for all supported platforms.
Fixes: #112
