Fix build on MinGW.

From Lubomir I. Ivanov <neolit123@gmail.com>.

THANKS

diff --git a/THANKS b/THANKS
index c6a28c9..1029de0 100644
--- a/THANKS
+++ b/THANKS
@@ -22,6 +22,7 @@
 Joel Ebrahimi <joel.ebrahimi@gmail.com>
 Jono Spiro <jono.spiro@gmail.com>
 Kohei Yoshida <kohei.yoshida@gmail.com>
+Lubomir I. Ivanov <neolit123@gmail.com>
 Martin Szulecki <m.szulecki@libimobiledevice.org>
 Michal Vyskocil <mvyskocil@suse.cz>
 Mikhail Gusarov <dottedmag@dottedmag.net>.

lib/zip_source_filep.c

diff --git a/lib/zip_source_filep.c b/lib/zip_source_filep.c
index 81a4158..d8310c8 100644
--- a/lib/zip_source_filep.c
+++ b/lib/zip_source_filep.c
@@ -39,9 +39,11 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#ifdef _MSC_VER
-/* MSVC needs <fcntl.h> for _O_BINARY */
+#ifdef _WIN32
+/* WIN32 needs <fcntl.h> for _O_BINARY */
 #include <fcntl.h>
+#endif
+#ifdef _MSC_VER
 /* MSVC doesn't have S_ISREG */
 #define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
 /* MSVC doesn't have mode_t */