Revert "Use -Werror in external/libtextclassifier"

This reverts commit 5ad580853dfd09088f3b1363075cd9d149f12034.

Change-Id: I86805c4523c598227cd65fd496722627a5f58df1
diff --git a/Android.bp b/Android.bp
index acde795..a886a0c 100644
--- a/Android.bp
+++ b/Android.bp
@@ -12,8 +12,6 @@
         "util/hash/hash.cc"
     ],
     cflags: [
-        "-DNAMESPACE_FOR_HASH_FUNCTIONS=farmhash",
-        "-Wall",
-        "-Werror",
+        "-DNAMESPACE_FOR_HASH_FUNCTIONS=farmhash"
     ],
 }