7052272: (aio) Definition of ConnectEx doesn't specify PASCAL calling convention

[Alan Bateman]

The asynchronous I/O implementation on Windows defines the ConnectEx 
extension without specifying the calling convention and so doesn't match 
the actual calling convention. This creates potential issues although we 
haven't had any reports. Easily fixed with the attached patch. This one 
is for jdk8 (too late for jdk7).

-Alan


diff --git 
a/src/windows/native/sun/nio/ch/WindowsAsynchronousSocketChannelImpl.c 
b/src/windows/native/sun/nio/ch/WindowsAsynchronousSocketChannelImpl.c
--- a/src/windows/native/sun/nio/ch/WindowsAsynchronousSocketChannelImpl.c
+++ b/src/windows/native/sun/nio/ch/WindowsAsynchronousSocketChannelImpl.c
@@ -44,7 +44,7 @@
 #define SO_UPDATE_CONNECT_CONTEXT 0x7010
 #endif
 
-typedef BOOL (*ConnectEx_t)
+typedef BOOL (PASCAL *ConnectEx_t)
 (
     SOCKET s,
     const struct sockaddr* name,