internal/binres: skip some tests if ANDROID_HOME is unset

Instead of failing.

Change-Id: I157f77aca1d02bfcdcf4f06278bcf5cc786834df
Reviewed-on: https://go-review.googlesource.com/18616
Reviewed-by: Daniel Skinner <daniel@dasa.cc>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
diff --git a/internal/binres/binres_test.go b/internal/binres/binres_test.go
index 81a0659..9a41966 100644
--- a/internal/binres/binres_test.go
+++ b/internal/binres/binres_test.go
@@ -231,7 +231,7 @@
 func TestOpenTable(t *testing.T) {
 	sdkdir := os.Getenv("ANDROID_HOME")
 	if sdkdir == "" {
-		t.Fatal("ANDROID_HOME env var not set")
+		t.Skip("ANDROID_HOME env var not set")
 	}
 	tbl, err := OpenTable(path.Join(sdkdir, "platforms/android-15/android.jar"))
 	if err != nil {
@@ -270,7 +270,7 @@
 func TestTableRefByName(t *testing.T) {
 	sdkdir := os.Getenv("ANDROID_HOME")
 	if sdkdir == "" {
-		t.Fatal("ANDROID_HOME env var not set")
+		t.Skip("ANDROID_HOME env var not set")
 	}
 	tbl, err := OpenTable(path.Join(sdkdir, "platforms/android-15/android.jar"))
 	if err != nil {