Merge pull request #34002 from 3405691582/EraseNotUnsetEnv

Author: swift-ci

test/ModuleInterface/swift_build_sdk_interfaces/early-exits.test-sh

@@ -1,7 +1,7 @@
 RUN: env SWIFT_EXEC=%swiftc_driver_plain not %{python} %utils/swift_build_sdk_interfaces.py %mcp_opt 2>&1 | %FileCheck -check-prefix NO-OUTPUT %s
 NO-OUTPUT: argument -o is required
 
-RUN: env -u SDKROOT SWIFT_EXEC=%swiftc_driver_plain not %{python} %utils/swift_build_sdk_interfaces.py %mcp_opt -o %t 2>&1 | %FileCheck -check-prefix NO-SDK %s
+RUN: env SDKROOT='' SWIFT_EXEC=%swiftc_driver_plain not %{python} %utils/swift_build_sdk_interfaces.py %mcp_opt -o %t 2>&1 | %FileCheck -check-prefix NO-SDK %s
 NO-SDK: SDKROOT must be set
 
 RUN: env SWIFT_EXEC=%swiftc_driver_plain not %{python} %utils/swift_build_sdk_interfaces.py %mcp_opt -o %t -sdk %S/nonexistent 2>&1 | %FileCheck -check-prefix BAD-SDK %s