Fix the android-cloexec-* warnings in bootable/recovery

Add the O_CLOEXEC or 'e' accordingly.

Bug: 63510015
Test: recovery tests pass
Change-Id: I7094bcc6af22c9687eb535116b2ca6a59178b303
diff --git a/tests/manual/recovery_test.cpp b/tests/manual/recovery_test.cpp
index d36dd33..92c6ef2 100644
--- a/tests/manual/recovery_test.cpp
+++ b/tests/manual/recovery_test.cpp
@@ -141,7 +141,7 @@
   // under recovery.
   void SetUp() override {
     std::string file_path = GetParam();
-    fp = fopen(file_path.c_str(), "rb");
+    fp = fopen(file_path.c_str(), "rbe");
     ASSERT_NE(nullptr, fp);
 
     unsigned char header[8];