Merge pull request #2363 from tvolkert/google3

Fix sky_snapshot build to only link libgcc_s if on Linux

engine/src/flutter/sky/tools/sky_snapshot/BUILD.gn

@@ -24,11 +24,13 @@ executable("sky_snapshot") {
     "//third_party/zlib",
   ]
 
-  ldflags = [
-    # libgcc_s is not a DT_NEEDED library; it normally gets loaded implicitly.
-    # This flag ensures that rpath is referenced when searching for
-    # the so, which in turn gets the resulting sky_snapshot binary
-    # closer to being able to run in Google's production environment. 
-    "-lgcc_s",
-  ]
+  if (!is_ios && !is_mac) {
+    ldflags = [
+      # libgcc_s is not a DT_NEEDED library; it normally gets loaded implicitly.
+      # This flag ensures that rpath is referenced when searching for
+      # the so, which in turn gets the resulting sky_snapshot binary
+      # closer to being able to run in Google's production environment.
+      "-lgcc_s",
+    ]
+  }
 }