[Refactoring] Introduced common/os/ directory for platform dependent
implementations and move vsnprintf() declaration there.

[Refactoring] Introduced common/common-config.win.h for handling WIN32
platform specifics.


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@3167 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/common/common-config.win.h b/common/common-config.win.h
new file mode 100644
index 0000000..e68d372
--- /dev/null
+++ b/common/common-config.win.h
@@ -0,0 +1,4 @@
+/* common-config.win.h - Platform-specific definitions for Windows */
+
+#define HAVE_VSNPRINTF 1
+#define vsnprintf _vsnprintf