Replace ANDROID with __ANDROID__ (#4909)

__ANDROID__ is always set by the toolchain and less likely to cause
conflicts than ANDROID. This change also removes the -DANDROID flag
we set ourselves in our toolchain CMake files since we don't need
it anymore.

libs/utils/src/JobSystem.cpp

@@ -39,7 +39,7 @@ static constexpr bool DEBUG_FINISH_HANGS = false;
 #    include <pthread.h>
 #endif
 
-#ifdef ANDROID
+#ifdef __ANDROID__
 #    include <sys/time.h>
 #    include <sys/resource.h>
 #    ifndef ANDROID_PRIORITY_URGENT_DISPLAY
@@ -81,7 +81,7 @@ void JobSystem::setThreadName(const char* name) noexcept {
 }
 
 void JobSystem::setThreadPriority(Priority priority) noexcept {
-#ifdef ANDROID
+#ifdef __ANDROID__
     int androidPriority = 0;
     switch (priority) {
         case Priority::NORMAL: