Fixed some POSIX-related issues when compiling with MSVC
diff --git a/lib/zip_source_filep.c b/lib/zip_source_filep.c
index e838506..81a4158 100644
--- a/lib/zip_source_filep.c
+++ b/lib/zip_source_filep.c
@@ -39,6 +39,14 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#ifdef _MSC_VER
+/* MSVC needs <fcntl.h> for _O_BINARY */
+#include <fcntl.h>
+/* MSVC doesn't have S_ISREG */
+#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
+/* MSVC doesn't have mode_t */
+typedef int mode_t;
+#endif
struct read_file {
zip_error_t error; /* last error information */
