Do not include POSIX-specific bits from public headers
On MSVC, there's no <unistd.h>. The only relevant types used directly
via this header is `size_t` (which is already available via other
headers, so let's use one of these instead), and `ssize_t`. The latter
appears to be a POSIX extension. We already have a workaround in our
compattibility, faux unistd.h, but it's problematic to install that one
"publicly" -- and we should not use private bits from a public
interface, anyway.
Fix this via using a MSVC typedef, and adjust the compat header as well.
This means that there's now an #ifdef in a public header, but hey, it's
just one thing, and there's no way around that.
diff --git a/compat/posix-shims/unistd.h b/compat/posix-shims/unistd.h
index 95bcecc..d7679c5 100644
--- a/compat/posix-shims/unistd.h
+++ b/compat/posix-shims/unistd.h
@@ -39,11 +39,7 @@
#define timegm _mkgmtime
/* read, write, and close are NOT being #defined here, because while there are file handle specific versions for Windows, they probably don't work for sockets. You need to look at your app and consider whether to call e.g. closesocket(). */
-#ifdef _WIN64
-#define ssize_t __int64
-#else
-#define ssize_t long
-#endif
+#define ssize_t SSIZE_T
#define STDIN_FILENO 0
#define STDOUT_FILENO 1
diff --git a/src/out.h b/src/out.h
index e2fd0b1..ca97eff 100644
--- a/src/out.h
+++ b/src/out.h
@@ -16,7 +16,10 @@
#define LY_OUT_H_
#include <stdio.h>
-#include <unistd.h>
+#include <sys/types.h>
+#ifdef _MSC_VER
+# define ssize_t SSIZE_T
+#endif
#include "log.h"