Windows SDK: define BEGIN_DECLS/END_DECLS.

These macros are not provided by MingW by default.

Change-Id: I623fda6c8e25e26573543c9368ebad47abc7f5c3

core/combo/include/arch/windows/AndroidConfig.h

@@ -15,7 +15,7 @@
  */
 
 /*
- * Android config -- "CYGWIN_NT-5.1".  
+ * Android config -- "CYGWIN_NT-5.1".
  *
  * Cygwin has pthreads, but GDB seems to get confused if you use it to
  * create threads.  By "confused", I mean it freezes up the first time the
@@ -37,6 +37,24 @@
  * comments.
  */
 
+/* MingW doesn't define __BEGIN_DECLS / __END_DECLS. */
+
+#ifndef __BEGIN_DECLS
+#  ifdef __cplusplus
+#    define __BEGIN_DECLS extern "C" {
+#  else
+#    define __BEGIN_DECLS
+#  endif
+#endif
+
+#ifndef __END_DECLS
+#  ifdef __cplusplus
+#    define __END_DECLS }
+#  else
+#    define __END_DECLS
+#  endif
+#endif
+
 /*
  * Threading model.  Choose one:
  *