remove whitespaces from rust-env directives

Signed-off-by: Shunpoco <[email protected]>

Author: Shunpoco

src/tools/miri/tests/panic/panic1.rs

@@ -1,4 +1,4 @@
-//@rustc-env: RUST_BACKTRACE=1
+//@rustc-env:RUST_BACKTRACE=1
 //@compile-flags: -Zmiri-disable-isolation
 
 fn main() {

src/tools/miri/tests/pass/backtrace/backtrace-global-alloc.rs

@@ -1,5 +1,5 @@
 //@compile-flags: -Zmiri-disable-isolation
-//@rustc-env: RUST_BACKTRACE=1
+//@rustc-env:RUST_BACKTRACE=1
 
 use std::alloc::System;
 use std::backtrace::Backtrace;

src/tools/miri/tests/pass/backtrace/backtrace-std.rs

@@ -1,5 +1,5 @@
 //@compile-flags: -Zmiri-disable-isolation
-//@rustc-env: RUST_BACKTRACE=1
+//@rustc-env:RUST_BACKTRACE=1
 
 use std::backtrace::Backtrace;
 

tests/rustdoc-ui/doctest/unparseable-doc-test.rs

@@ -2,7 +2,7 @@
 //@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
 //@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
 //@ failure-status: 101
-//@ rustc-env: RUST_BACKTRACE=0
+//@ rustc-env:RUST_BACKTRACE=0
 
 /// ```rust
 /// let x = 7;

tests/ui/proc-macro/env.rs

@@ -1,6 +1,6 @@
 //@ aux-build:env.rs
 //@ run-pass
-//@ rustc-env: THE_CONST=1
+//@ rustc-env:THE_CONST=1
 //@ compile-flags: -Zunstable-options --env-set THE_CONST=12 --env-set ANOTHER=4
 
 #![crate_name = "foo"]