Fix rustc testsuite

Author: bjorn3

scripts/test_rustc_tests.sh

@@ -134,6 +134,8 @@ rm -r tests/run-make/const-trait-stable-toolchain # same
 rm -r tests/run-make/print-request-help-stable-unstable # same
 rm -r tests/run-make/incr-add-rust-src-component
 rm tests/ui/errors/remap-path-prefix-sysroot.rs # different sysroot source path
+rm -r tests/run-make/export/extern-opt # something about rustc version mismatches
+rm -r tests/run-make/export # same
 
 # genuine bugs
 # ============