libport: Fix the Cygwin build.

configure

@@ -17442,7 +17442,7 @@ fi ;;
     MSVCRTFLAGS=""
 
   case $host_os in
-    cygwin*|mingw32*) ;;
+    mingw32*) ;;
     *) { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports -fno-builtin" >&5
 $as_echo_n "checking whether the compiler supports -fno-builtin... " >&6; }
 if ${ac_cv_cflags__fno_builtin+:} false; then :

configure.ac

@@ -2054,7 +2054,7 @@ char*f(const char *h,char n) {return strchr(h,n);}]])],[ac_cv_c_logicalop_noisy=
   dnl Disable gcc builtins except for Mingw
   AC_SUBST(MSVCRTFLAGS,"")
   case $host_os in
-    cygwin*|mingw32*) ;;
+    mingw32*) ;;
     *) WINE_TRY_CFLAGS([-fno-builtin],[MSVCRTFLAGS="$MSVCRTFLAGS -fno-builtin"])
        WINE_TRY_CFLAGS([-fshort-wchar],[MSVCRTFLAGS="$MSVCRTFLAGS -fshort-wchar"]) ;;
   esac

include/wine/port.h

@@ -47,7 +47,7 @@
  * Hard-coded values for the Windows platform
  */
 
-#ifdef _WIN32
+#if defined(_WIN32) && !defined(__CYGWIN__)
 
 #include <direct.h>
 #include <io.h>

libs/port/spawn.c

@@ -21,7 +21,7 @@
 #include "config.h"
 #include "wine/port.h"
 
-#if !defined(HAVE__SPAWNVP) && !defined(_WIN32)
+#if !defined(HAVE__SPAWNVP) && (!defined(_WIN32) || defined(__CYGWIN__))
 
 #include <errno.h>
 #include <signal.h>