Merge "external/boringssl: Build as C11 and drop _XOPEN_SOURCE" am: 1f65662f46

Original change: https://android-review.googlesource.com/c/platform/external/boringssl/+/1965301

Change-Id: I62502c00b29080727d2e15e2ccdfb6141a8f66be
diff --git a/Android.bp b/Android.bp
index 7ee3395..ea7a7bd 100644
--- a/Android.bp
+++ b/Android.bp
@@ -60,17 +60,11 @@
         "-Werror",
     ],
 
-    conlyflags: ["-std=c99"],
+    c_std: "gnu11",
 
     // Build BoringSSL and its tests against the same STL.
     sdk_version: "9",
     target: {
-        linux: {
-            cflags: ["-D_XOPEN_SOURCE=700"],
-        },
-        windows: {
-            cflags: ["-D_XOPEN_SOURCE=700"],
-        },
         android: {
             stl: "libc++_static",
         },