Tests: make t_prot_lib*.pl name mangling deterministic

This is to facilitate diffing generated files in tests.

test_regress/t/t_prot_lib.pl

@@ -35,6 +35,8 @@ while (1) {
                 $secret_dir,
                 "--protect-lib",
                 $secret_prefix,
+                "--protect-key",
+                "secret-key",
                 "t/t_prot_lib_secret.v"],
         verilator_run => 1,
         );

test_regress/t/t_prot_lib_clk_gated.pl

@@ -37,6 +37,8 @@ while (1) {
                 "-GGATED_CLK=1",
                 "--protect-lib",
                 $secret_prefix,
+                "--protect-key",
+                "secret-key",
                 "t/t_prot_lib_secret.v"],
         verilator_run => 1,
         );

test_regress/t/t_prot_lib_comb.pl

@@ -35,6 +35,8 @@ while (1) {
                 $secret_dir,
                 "--protect-lib",
                 $secret_prefix,
+                "--protect-key",
+                "secret-key",
                 "t/t_prot_lib_comb.v"],
         verilator_run => 1,
         );

test_regress/t/t_prot_lib_inout_bad.pl

@@ -12,7 +12,10 @@ scenarios(vlt => 1);
 
 compile (
     verilator_flags2 => ["--protect-lib",
-                         "secret"],
+                         "secret",
+                         "--protect-key",
+                         "secret-key"
+                       ],
     verilator_make_gcc => 0,
     fails => 1,
     expect_filename => $Self->{golden_filename},

test_regress/t/t_prot_lib_shared.pl

@@ -39,6 +39,8 @@ while (1) {
                 $secret_dir,
                 "--protect-lib",
                 $secret_prefix,
+                "--protect-key",
+                "secret-key",
                 "t/t_prot_lib_secret.v"],
         verilator_run => 1,
         );