Tests: Favor --binary. No test change.

test_regress/t/t_flag_prefix.py

@@ -13,12 +13,10 @@ test.scenarios('vlt')
 
 test.compile(
     verilator_flags2=[
+        "--binary",
         "--prefix t_flag_prefix",  # should be overridden
         "--prefix Vprefix",
-        "--exe",
-        "--main",
-        "--stats",
-        "--build"
+        "--stats"
     ],
     verilator_make_cmake=False,
     verilator_make_gmake=False)

test_regress/t/t_mod_dollar$.py

@@ -15,9 +15,8 @@ test.scenarios('vlt')
 # prefix properly using post-escaped identifiers
 test.run(cmd=[
     os.environ["VERILATOR_ROOT"] + "/bin/verilator",
-    "--cc",
+    "--binary",
     "--Mdir " + test.obj_dir + "/t_mod_dollar",
-    "--exe --build --main",
     't/t_mod_dollar$.v',
 ],
          verilator_run=True)

test_regress/t/t_mod_dot.py

@@ -15,9 +15,8 @@ test.scenarios('vlt')
 # prefix properly using post-escaped identifiers
 test.run(cmd=[
     os.environ["VERILATOR_ROOT"] + "/bin/verilator",
-    "--cc",
+    "--binary",
     "--Mdir " + test.obj_dir + "/t_mod_dot",
-    "--exe --build --main",
     't/t_mod_dot.v',
 ],
          verilator_run=True)