Binder RPC test: check execl return status

Also, add pragma guard to Utils.h since they are sometimes included in tests

Bug: 302723053
Test: atest binderRpcTest
Change-Id: Ic2632747375fa4847e1077d41dfa3192af68441d
diff --git a/libs/binder/tests/binderRpcTest.cpp b/libs/binder/tests/binderRpcTest.cpp
index b86eb94..8e42ec2 100644
--- a/libs/binder/tests/binderRpcTest.cpp
+++ b/libs/binder/tests/binderRpcTest.cpp
@@ -287,8 +287,10 @@
 
                 auto writeFd = std::to_string(writeEnd.get());
                 auto readFd = std::to_string(readEnd.get());
-                execl(servicePath.c_str(), servicePath.c_str(), writeFd.c_str(), readFd.c_str(),
-                      NULL);
+                auto status = execl(servicePath.c_str(), servicePath.c_str(), writeFd.c_str(),
+                                    readFd.c_str(), NULL);
+                PLOGF("execl('%s', _, %s, %s) should not return at all, but it returned %d",
+                      servicePath.c_str(), writeFd.c_str(), readFd.c_str(), status);
             }));
 
     BinderRpcTestServerConfig serverConfig;