Update the NDK ARM ABI to armv7.

We don't support armv5 any more, and we can't build bionic as armv5.

Test: build/soong/scripts/build-ndk-prebuilts.sh
Bug: https://github.com/android-ndk/ndk/issues/272
Change-Id: I4026d48e7d5db78f6aa4e9796da1ec9cf10021ca
diff --git a/android/arch.go b/android/arch.go
index af3919c..3a22569 100644
--- a/android/arch.go
+++ b/android/arch.go
@@ -971,7 +971,7 @@
 
 func getNdkAbisConfig() []archConfig {
 	return []archConfig{
-		{"arm", "armv5te", "", []string{"armeabi"}},
+		{"arm", "armv7-a", "", []string{"armeabi"}},
 		{"arm64", "armv8-a", "", []string{"arm64-v8a"}},
 		{"x86", "", "", []string{"x86"}},
 		{"x86_64", "", "", []string{"x86_64"}},