Re-make showmap host supported

Also fix bugs that made it not compile on host. Motivation is to be
able to analyze smaps files easily on the host.

Test: showmap -f maps.txt
Bug: 137034556

Change-Id: I7b8ca1237ce1ec17d02cd5217c73b62ee978cb05
diff --git a/libmeminfo/Android.bp b/libmeminfo/Android.bp
index fc022bd..8eb41b9 100644
--- a/libmeminfo/Android.bp
+++ b/libmeminfo/Android.bp
@@ -30,6 +30,7 @@
 
 cc_library {
     name: "libmeminfo",
+    host_supported: true,
     defaults: ["libmeminfo_defaults"],
     export_include_dirs: ["include"],
     export_shared_lib_headers: ["libbase"],