Disable test broken due to upstream bug

Author: bjorn3

scripts/test_rustc_tests.sh

@@ -145,6 +145,7 @@ rm tests/ui/codegen/subtyping-enforces-type-equality.rs # assert_assignable bug
 # ======================
 rm tests/ui/backtrace.rs # TODO warning
 rm tests/ui/process/nofile-limit.rs # TODO some AArch64 linking issue
+rm tests/ui/async-await/async-closures/once.rs # FIXME bug in the rustc FnAbi calculation code
 
 rm tests/ui/stdio-is-blocking.rs # really slow with unoptimized libstd