Use signal-block around fork() to avoid we block it.

runtime/bin/process_android.cc

Index: runtime/bin/process_android.cc
diff --git a/runtime/bin/process_android.cc b/runtime/bin/process_android.cc
index eda6e9b23b17d53ff1f472253abfbdc9d9415687..18e4b59af773e49ae77cd33ef9963fb36a055600 100644
--- a/runtime/bin/process_android.cc
+++ b/runtime/bin/process_android.cc
@@ -151,7 +151,7 @@ class ExitCodeHandler {
     running_ = false;
 
     // Fork to wake up waitpid.
-    if (TEMP_FAILURE_RETRY(fork()) == 0) {
+    if (TEMP_FAILURE_RETRY_BLOCK_SIGNALS(fork()) == 0) {
       exit(0);
     }
 
@@ -350,7 +350,7 @@ int Process::Start(const char* path,
     program_environment[environment_length] = NULL;
   }
 
-  pid = TEMP_FAILURE_RETRY(fork());
+  pid = TEMP_FAILURE_RETRY_BLOCK_SIGNALS(fork());
   if (pid < 0) {
     SetChildOsErrorMessage(os_error_message);
     delete[] program_arguments;