Windows: Include <fcntl.h> for file constants.

This header is required by POSIX for the constants (O_RDONLY, etc.)
but we were only including it on Unix systems as a side effect of
including <unistd.h>.

src/nvim/ex_cmds2.c

@@ -6,6 +6,7 @@
 #include <inttypes.h>
 #include <stdbool.h>
 #include <string.h>
+#include <fcntl.h>
 
 #include "nvim/vim.h"
 #include "nvim/ascii.h"

src/nvim/fileio.c

@@ -7,6 +7,7 @@
 #include <stdbool.h>
 #include <string.h>
 #include <inttypes.h>
+#include <fcntl.h>
 
 #include "nvim/vim.h"
 #include "nvim/ascii.h"

src/nvim/if_cscope.c

@@ -11,6 +11,7 @@
 #include <assert.h>
 #include <errno.h>
 #include <inttypes.h>
+#include <fcntl.h>
 
 #include "nvim/vim.h"
 #include "nvim/ascii.h"

src/nvim/memfile.c

@@ -40,6 +40,7 @@
 #include <limits.h>
 #include <string.h>
 #include <stdbool.h>
+#include <fcntl.h>
 
 #include "nvim/vim.h"
 #include "nvim/ascii.h"

src/nvim/memline.c

@@ -38,6 +38,7 @@
 #include <inttypes.h>
 #include <string.h>
 #include <stdbool.h>
+#include <fcntl.h>
 
 #include "nvim/ascii.h"
 #include "nvim/vim.h"

src/nvim/shada.c

@@ -5,6 +5,7 @@
 #include <stdint.h>
 #include <inttypes.h>
 #include <errno.h>
+#include <fcntl.h>
 #ifdef HAVE_UNISTD_H
 # include <unistd.h>
 #endif

src/nvim/undo.c

@@ -77,6 +77,7 @@
 #include <limits.h>
 #include <stdbool.h>
 #include <string.h>
+#include <fcntl.h>
 
 #include "nvim/vim.h"
 #include "nvim/ascii.h"