Hopefully fix validatekeymaps mac build.

Only link in libbinder for linux builds.

Bug: 172023026
Test: m validatekeymaps
Change-Id: Ibdcdfab2c5160644b9b9453e56a76d47f6d2b9b4

tools/validatekeymaps/Android.bp

@@ -16,18 +16,25 @@ cc_binary_host {
 
     static_libs: [
         "libbase",
-        "libbinder",
         "libinput",
         "libutils",
         "libcutils",
         "liblog",
         "libui-types",
     ],
+    target: {
+        linux_glibc: {
+            static_libs: [
+                // libbinder is only available for linux
+                "libbinder",
+            ],
+        },
+    },
 
     // This tool is prebuilt if we're doing an app-only build.
     product_variables: {
         unbundled_build: {
-          enabled: false,
+            enabled: false,
         },
     },
 }