chore: fix build

Author: ovr

build.rs

@@ -5,7 +5,6 @@ fn main() {
     let src = PathBuf::from("src");
     let mut bridge = cxx_build::bridge(src.join("bridge.rs"));
 
-    assert!(bridge.is_flag_supported("-std=c++11").expect("supported"));
     bridge
         .files(&[
             datasketches.join("cpc.cpp"),
@@ -14,7 +13,7 @@ fn main() {
             datasketches.join("hh.cpp"),
         ])
         .include(datasketches.join("common").join("include"))
-        .flag_if_supported("-std=c++11")
+        .flag("-std=c++11")
         .cpp_link_stdlib(None)
         .static_flag(true)
         .compile("libdatasketches.a");