[LyX/2.3-staging] Fix return types for mingw-w64

[Georg Baum]

commit 6b7d30863adda81951ad696454a829445c14b047
Author: Shankar Giri Venkita Giri <gir...@gmx.com>
Date:   Thu May 5 12:54:53 2016 +0200

    Fix return types for mingw-w64
    
    This is needed for warning-free compilation with mingw-w64, and does not 
hurt
    for other build configurations. Patch by Shankar Giri Venkita Giri (bug 
10053).

diff --git a/src/support/filetools.cpp b/src/support/filetools.cpp
index 310e621..657343f 100644
--- a/src/support/filetools.cpp
+++ b/src/support/filetools.cpp
@@ -1065,7 +1065,7 @@ cmd_ret const runCommand(string const & cmd)
                                0, 0, &startup, &process)) {
 
                        CloseHandle(process.hThread);
-                       int fno = _open_osfhandle((long)in, _O_RDONLY);
+                       int fno = _open_osfhandle(static_cast<intptr_t>(in), 
_O_RDONLY);
                        CloseHandle(out);
                        inf = _fdopen(fno, "r");
                }
diff --git a/src/support/os_win32.cpp b/src/support/os_win32.cpp
index 292555d..a6e5da7 100644
--- a/src/support/os_win32.cpp
+++ b/src/support/os_win32.cpp
@@ -569,7 +569,7 @@ bool autoOpenFile(string const & filename, auto_open_mode 
const mode,
 
        // reference: http://msdn.microsoft.com/en-us/library/bb762153.aspx
        char const * action = (mode == VIEW) ? "open" : "edit";
-       bool success = reinterpret_cast<int>(ShellExecute(NULL, action,
+       bool success = reinterpret_cast<intptr_t>(ShellExecute(NULL, action,
                to_local8bit(from_utf8(filename)).c_str(), NULL, NULL, 1)) > 32;
 
        if (!path.empty() && !lyxrc.texinputs_prefix.empty()) {