recovery: Switch applypatch/ and updater/ to cpp.

Mostly trivial changes to make cpp compiler happy.

Change-Id: I1b0481465c67c3bbca35a839d0764190d84ff34e
(cherry picked from commit ba9a42aa7e10686de186636fe9fecbf8c4cc7c19)
diff --git a/minzip/Hash.h b/minzip/Hash.h
index 8194537..e83eac4 100644
--- a/minzip/Hash.h
+++ b/minzip/Hash.h
@@ -15,6 +15,10 @@
 #include <stdbool.h>
 #include <assert.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* compute the hash of an item with a specific type */
 typedef unsigned int (*HashCompute)(const void* item);
 
@@ -183,4 +187,8 @@
 void mzHashTableProbeCount(HashTable* pHashTable, HashCalcFunc calcFunc,
     HashCompareFunc cmpFunc);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /*_MINZIP_HASH*/