Prefix LOG and CHECK with AOS_

This prepares us for introducing glog more widely and transitioning
things over where they make sense.

Change-Id: Ic6c208882407bc2153fe875ffc736d66f5c8ade5
diff --git a/aos/ipc_lib/signalfd.cc b/aos/ipc_lib/signalfd.cc
index 1679b46..045444b 100644
--- a/aos/ipc_lib/signalfd.cc
+++ b/aos/ipc_lib/signalfd.cc
@@ -18,7 +18,7 @@
   }
   // Then build a signalfd.  Make it nonblocking so it works well with an epoll
   // loop, and have it close on exec.
-  PCHECK(fd_ = signalfd(-1, &mask_, SFD_NONBLOCK | SFD_CLOEXEC));
+  AOS_PCHECK(fd_ = signalfd(-1, &mask_, SFD_NONBLOCK | SFD_CLOEXEC));
   // Now that we have a consumer of the signal, block the signals so the
   // signalfd gets them.
   pthread_sigmask(SIG_BLOCK, &mask_, nullptr);
@@ -27,7 +27,7 @@
 SignalFd::~SignalFd() {
   // Unwind the constructor.  Unblock the signals and close the fd.
   pthread_sigmask(SIG_UNBLOCK, &mask_, nullptr);
-  PCHECK(close(fd_));
+  AOS_PCHECK(close(fd_));
 }
 
 signalfd_siginfo SignalFd::Read() {