Allow libmath to be built on windows

Bug: 136263238
Test: builds
Change-Id: I4b0847b581d695771e3ad26efbb4f534d50e4072
diff --git a/libs/math/Android.bp b/libs/math/Android.bp
index 693bace..8e903e3 100644
--- a/libs/math/Android.bp
+++ b/libs/math/Android.bp
@@ -17,6 +17,11 @@
     host_supported: true,
     vendor_available: true,
     export_include_dirs: ["include"],
+    target:  {
+        windows: {
+            enabled: true,
+        }
+    }
 }
 
 subdirs = ["tests"]