Run some inputflinger_tests on host

Sometimes, it's convenient to execute the input tests without having a
connected device. This is especially useful when doing cherry-picks of
patch on a cloud device.

Allow input code to build for host, and enable the tests for running on
host.

Bug: 249591924
Test: atest --host --no-bazel-mode -c -m inputflinger_tests
Change-Id: Ib9be6a5fb6c35ffc450e41cb2a5688bfb2c8d01a
diff --git a/services/inputflinger/reader/mapper/MultiTouchInputMapper.cpp b/services/inputflinger/reader/mapper/MultiTouchInputMapper.cpp
index 1d53eab..acba4f6 100644
--- a/services/inputflinger/reader/mapper/MultiTouchInputMapper.cpp
+++ b/services/inputflinger/reader/mapper/MultiTouchInputMapper.cpp
@@ -17,8 +17,9 @@
 #include "../Macros.h"
 
 #include "MultiTouchInputMapper.h"
-
+#if defined(__ANDROID__)
 #include <android/sysprop/InputProperties.sysprop.h>
+#endif
 
 namespace android {
 
@@ -362,7 +363,12 @@
 
 bool MultiTouchInputMapper::shouldSimulateStylusWithTouch() const {
     static const bool SIMULATE_STYLUS_WITH_TOUCH =
+#if defined(__ANDROID__)
             sysprop::InputProperties::simulate_stylus_with_touch().value_or(false);
+#else
+            // Disable this developer feature where sysproperties are not available
+            false;
+#endif
     return SIMULATE_STYLUS_WITH_TOUCH &&
             mParameters.deviceType == Parameters::DeviceType::TOUCH_SCREEN;
 }