[LyX/master] Fix compatibility issue with 64-bit cygwin.

[Enrico Forestieri]

commit b3735501c7952ec53600f94d90ae8e164300ca76
Date: Fri Jul 11 16:49:10 2014 +0200
Fix compatibility issue with 64-bit cygwin.

Richard, can this be applied to the stable branch?

diff --git a/src/support/os_cygwin.cpp b/src/support/os_cygwin.cpp
index e0c0bd1..572273c 100644
--- a/src/support/os_cygwin.cpp
+++ b/src/support/os_cygwin.cpp
@@ -449,7 +449,7 @@ bool autoOpenFile(string const & filename, auto_open_mode const mode,
// reference: http://msdn.microsoft.com/en-us/library/bb762153.aspx
string const win_path = to_local8bit(from_utf8(convert_path(filename, PathStyle(windows))));
char const * action = (mode == VIEW) ? "open" : "edit";
- bool success = reinterpret_cast<int>(ShellExecute(NULL, action,
+ bool success = reinterpret_cast<long>(ShellExecute(NULL, action,
win_path.c_str(), NULL, NULL, 1)) > 32;
if (!path.empty() && !lyxrc.texinputs_prefix.empty()) {