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Fix compiling libstd with emscripten target.
Was getting error: ``` running: "sh" "/home/flubba86/rust/src/libstd/../libbacktrace/configure" "--with-pic" "--disable-multilib" "--disable-shared" "--disable-host-shared" "--host=asmjs-unknown-emscripten" "--build=x86_64-unknown-linux-gnu" ... Invalid configuration `asmjs-unknown-emscripten': system `emscripten' not recognized ``` Undo change to libbacktrace configure script. Modify libstd build.rs to not build libbacktrace in the case of targeting emscripten.
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src/libstd/build.rs

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@@ -23,7 +23,7 @@ fn main() {
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let target = env::var("TARGET").unwrap();
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let host = env::var("HOST").unwrap();
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if !target.contains("apple") && !target.contains("msvc") {
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if !target.contains("apple") && !target.contains("msvc") && !target.contains("emscripten"){
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build_libbacktrace(&host, &target);
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}
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