Enable NDEBUG for libwebsockets on debuggable and host builds.

Test: pass
Change-Id: I27fa4dd6cbb683b7f47ee4c14499da7aae87fcb9
diff --git a/Android.bp b/Android.bp
index e8c7448..c1af17c 100644
--- a/Android.bp
+++ b/Android.bp
@@ -127,6 +127,13 @@
         "libcap",
     ],
     host_supported: true,
+    product_variables: {
+        debuggable: {
+            cflags: [
+                "-UNDEBUG",
+            ],
+        },
+    },
     target: {
         darwin: {
             enabled: false,
@@ -145,6 +152,7 @@
                 "libcrypto",
             ],
             cflags: [
+                "-UNDEBUG",
                 "-Wall",
                 "-Wsign-compare",
                 "-Wstrict-aliasing",