turn recovery into a C++ binary

Change-Id: I68a67a4c8edec9a74463b3d4766005ce27b51316
diff --git a/minzip/Zip.h b/minzip/Zip.h
index 9f99fba..739dbf5 100644
--- a/minzip/Zip.h
+++ b/minzip/Zip.h
@@ -14,6 +14,10 @@
 #include "Hash.h"
 #include "SysUtil.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /*
  * One entry in the Zip archive.  Treat this as opaque -- use accessors below.
  *
@@ -210,4 +214,8 @@
         int flags, const struct utimbuf *timestamp,
         void (*callback)(const char *fn, void*), void *cookie);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /*_MINZIP_ZIP*/