Update windows-link-job.swift

Fix an incorrect alteration to the test

Author: compnerd

test/Driver/windows-link-job.swift

@@ -1,7 +1,7 @@
 // RUN: %empty-directory(%t/DISTINCTIVE-WINDOWS-PATH/usr/bin)
 // RUN: %empty-directory(%t/DISTINCTIVE-WINDOWS-PATH/usr/lib)
 // RUN: %hardlink-or-copy(from: %swift_frontend_plain, to: %t/DISTINCTIVE-WINDOWS-PATH/usr/bin/swiftc)
-// RUN: %host-library-env PATH= %t/DISTINCTIVE-WINDOWS-PATH/usr/bin/swiftc -target x86_64-unknown-windows-msvc -### -module-name link -emit-library %s 2>&1 | %FileCheck %s
+// RUN: env PATH= %t/DISTINCTIVE-WINDOWS-PATH/usr/bin/swiftc -target x86_64-unknown-windows-msvc -### -module-name link -emit-library %s 2>&1 | %FileCheck %s
 
 // swift-frontend cannot be copied to another location with bootstrapping because
 // it will not find the libswiftCore library with its relative RPATH.