Change how build environment variable is set

It appears that some older versions of the Rust compiler do not like the
double colon syntax when setting environment variables for the build
process. Until the latest cargo release will only accept the double
colon syntax, use a single colon when setting environment variables in
build.rs.

Signed-off-by: Rory Dudley <rory@netc.lu>

1 files changed, 1 insertions, 1 deletions

diff --git a/build.rs b/build.rs
index a22f635..19eff11 100644
--- a/build.rs
+++ b/build.rs
@@ -10,7 +10,7 @@ fn main() {
     )
     .to_string();
     println!(
-        "cargo::rustc-env=DWVSH_BUILD={}",
+        "cargo:rustc-env=DWVSH_BUILD={}",
         build.get(0..7).unwrap_or(&build)
     );
 }