testsuite/rust: add a 10-second timeout for each compile test

Author: liushuyu

gcc/testsuite/lib/rust.exp

@@ -166,6 +166,10 @@ proc rust_target_compile { source dest type options } {
     global gluefile wrap_flags
     global ALWAYS_RUSTFLAGS
     global RUST_UNDER_TEST
+    global individual_timeout
+
+    # HACK: guard against infinite loops in the compiler
+    set individual_timeout 10
 
     if { [target_info needs_status_wrapper] != "" && [info exists gluefile] } {
 	lappend options "libs=${gluefile}"