Non-SFI mode: Add Linux asynchronous signal support

src/public/linux_syscalls/sys/syscall.h

Index: src/public/linux_syscalls/sys/syscall.h
diff --git a/src/public/linux_syscalls/sys/syscall.h b/src/public/linux_syscalls/sys/syscall.h
index cd6414929040e1291ea3e3de59c5a1f6fbe57076..a96c161ed1ed488f552ea4c3bd873cfcdfdff463 100644
--- a/src/public/linux_syscalls/sys/syscall.h
+++ b/src/public/linux_syscalls/sys/syscall.h
@@ -66,11 +66,13 @@ int syscall(int number, ...);
 # define __NR_fstat64            197
 # define __NR_getdents64         220
 # define __NR_fcntl64            221
+# define __NR_gettid             224
 # define __NR_futex              240
 # define __NR_set_thread_area    243
 # define __NR_exit_group         252
 # define __NR_clock_gettime      265
 # define __NR_clock_getres       266
+# define __NR_tgkill             270
 # define __NR_openat             295
 # define __NR_fstatat64          300
 
@@ -120,10 +122,12 @@ int syscall(int number, ...);
 # define __NR_fstat64            197
 # define __NR_getdents64         217
 # define __NR_fcntl64            221
+# define __NR_gettid             224
 # define __NR_futex              240
 # define __NR_exit_group         248
 # define __NR_clock_gettime      263
 # define __NR_clock_getres       264
+# define __NR_tgkill             268
 # define __NR_socketpair         288
 # define __NR_shutdown           293
 # define __NR_sendmsg            296