Make native bridge libc uninstallable

The native bridge libc.so is overridden by
//frameworks/libs/native_bridge_support/libc:libc, mark it
installable: false to avoid a collision in the install rules.
Allows removing BUILD_BROKEN_DUP_RULES from cuttlefish builds.

Bug: 204136549
Test: m checkbuild
Change-Id: I5379aa9595a714efdbe1ddc1ff4f65bb45fc67e8
diff --git a/libc/Android.bp b/libc/Android.bp
index ee8c280..2fdeb2b 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -1785,6 +1785,11 @@
     lto: {
         never: true,
     },
+    target: {
+        native_bridge: {
+            installable: false,
+        },
+    },
 }
 
 genrule {