DO NOT MERGE fmtlib_ndk: set min_sdk_version to 29

fmtlib_ndk is transitively (through libbase_ndk) is included in some
updatable apex modules that were introduced in Android R, hence it now
needs to explicitly specify minimal supported sdk version. Since
libbase_ndk sets min_sdk_version to 29, it makes sense to set
same value in fmtlib_ndk.

Test: m
Bug: 171330443
Change-Id: Iccc0c03d65dd70f733f3a25ffc7587ec8d1037dd
Merged-In: Iccc0c03d65dd70f733f3a25ffc7587ec8d1037dd
(cherry picked from commit 1a2a7fe335b9dd6a92a490ca1620e880639f2e0d)
diff --git a/Android.bp b/Android.bp
index 8a00674..294bb94 100644
--- a/Android.bp
+++ b/Android.bp
@@ -13,6 +13,7 @@
     },
     local_include_dirs: ["include"],
     export_include_dirs: ["include"],
+    min_sdk_version: "29",
 }
 
 // This is built into libbase.  If you want to use this library, link to libbase instead.
@@ -36,7 +37,6 @@
         "//apex_available:anyapex",
         "//apex_available:platform",
     ],
-    min_sdk_version: "29",
 }
 
 cc_library_static {