tests: Remove invalid target_env cfg (#169)

Author: polarathene

tests/example_crates.rs

@@ -23,8 +23,6 @@ fn test_crate(
     let arch = "i686";
     #[cfg(target_arch = "arm")]
     let arch = "armv5te";
-    #[cfg(target_env = "gnueabi")]
-    let env = "gnueabi";
     #[cfg(all(target_env = "gnu", target_abi = "eabi"))]
     let env = "gnueabi";
     #[cfg(all(target_env = "gnu", not(target_abi = "eabi")))]