Remove unnecessary use of vcvars batch script due to clang-cl.

Author: jdm

build.rs

@@ -19,32 +19,6 @@ fn main() {
         panic!("Rustc doesn't support MSVC debug runtime.");
     }
 
-    if target.contains("windows") && host != target {
-        assert_eq!(host, "x86_64-pc-windows-msvc",
-                   "Only cross-compiling from x64 is supported");
-        assert_eq!(target, "i686-pc-windows-msvc",
-                   "Only cross-compiling to x86 is supported");
-        assert!(env::var("VSINSTALLDIR").is_err());
-        // When cross-compiling on Windows, we need to ensure that the PATH is
-        // set up appropriately for the target before invoking make.
-        if env::var("VCVARSALL_PATH").is_err() {
-            panic!("Need to provide VCVARSALL_PATH value with path to \
-                    vcvarsall.bat from Visual Studio installation");
-        }
-
-        let vcvars = Command::new("vcvars.bat").output().unwrap();
-        assert!(vcvars.status.success());
-        let output = str::from_utf8(&vcvars.stdout).unwrap();
-        for line in output.lines() {
-	    let mut parts = line.splitn(2, '=');
-	    if let Some(name) = parts.next() {
-	        if let Some(value) = parts.next() {
-		    env::set_var(name, value);
-	        }
-	    }
-        }
-    }
-
     build_jsapi();
     build_jsglue();
     build_jsapi_bindings();