<stdbool.h> not necessary in C++.

Bug: N/A
Test: builds
Change-Id: I40fffe92d4273eab5a98bd65013bb9da2aea2171
diff --git a/libc/arch-x86/bionic/__set_tls.cpp b/libc/arch-x86/bionic/__set_tls.cpp
index 241d94a..3f58bc5 100644
--- a/libc/arch-x86/bionic/__set_tls.cpp
+++ b/libc/arch-x86/bionic/__set_tls.cpp
@@ -28,7 +28,6 @@
 
 #include <limits.h>
 #include <pthread.h>
-#include <stdbool.h>
 
 #include <asm/ldt.h>
 
diff --git a/libc/bionic/system_properties.cpp b/libc/bionic/system_properties.cpp
index 6906ecd..c57cd9c 100644
--- a/libc/bionic/system_properties.cpp
+++ b/libc/bionic/system_properties.cpp
@@ -31,7 +31,6 @@
 #include <fcntl.h>
 #include <poll.h>
 #include <stdatomic.h>
-#include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdlib.h>