Reland: "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.

Relands I5379aa9595a714efdbe1ddc1ff4f65bb45fc67e8 with a fix to
only apply to the shared variant.

Bug: 204136549
Test: m checkbuild
Change-Id: I84abb577e3bb924d39a369670d0b2dbfac45bbc4

libc/Android.bp

@@ -1785,6 +1785,13 @@ cc_library {
     lto: {
         never: true,
     },
+    target: {
+        native_bridge: {
+            shared: {
+                installable: false,
+            },
+        },
+    },
 }
 
 genrule {