Drop support for KitKat.

The NDK is dropping support for this.

Bug: https://github.com/android/ndk/issues/1751
Test: treehugger
Change-Id: I6c03dfc364e7612ce4f45fb58746726983cf5b74
diff --git a/android/config.go b/android/config.go
index d3f8ab4..15707a5 100644
--- a/android/config.go
+++ b/android/config.go
@@ -689,7 +689,7 @@
 }
 
 func (c *config) MinSupportedSdkVersion() ApiLevel {
-	return uncheckedFinalApiLevel(19)
+	return uncheckedFinalApiLevel(21)
 }
 
 func (c *config) FinalApiLevels() []ApiLevel {
diff --git a/cc/cc_test.go b/cc/cc_test.go
index 792a8e0..f025700 100644
--- a/cc/cc_test.go
+++ b/cc/cc_test.go
@@ -4145,7 +4145,7 @@
 		"${config.ArmArmv7ANeonCflags}",
 		"${config.ArmGenericCflags}",
 		"-target",
-		"armv7a-linux-androideabi20",
+		"armv7a-linux-androideabi21",
 	}
 
 	expectedIncludes := []string{
@@ -4176,7 +4176,6 @@
 		"external/foo/lib32",
 		"external/foo/libandroid_arm",
 		"defaults/cc/common/ndk_libc++_shared",
-		"defaults/cc/common/ndk_libandroid_support",
 	}
 
 	conly := []string{"-fPIC", "${config.CommonGlobalConlyflags}"}
@@ -4269,20 +4268,20 @@
 				},
 			},
 			stl: "libc++",
-			sdk_version: "20",
+			sdk_version: "minimum",
 		}
 
 		cc_library_headers {
 			name: "libheader1",
 			export_include_dirs: ["libheader1"],
-			sdk_version: "20",
+			sdk_version: "minimum",
 			stl: "none",
 		}
 
 		cc_library_headers {
 			name: "libheader2",
 			export_include_dirs: ["libheader2"],
-			sdk_version: "20",
+			sdk_version: "minimum",
 			stl: "none",
 		}
 	`, tc.src)
@@ -4306,7 +4305,7 @@
 			cc_library {
 				name: "%s",
 				export_include_dirs: ["%s"],
-				sdk_version: "20",
+				sdk_version: "minimum",
 				stl: "none",
 			}
 		`, lib, lib)