Ignore symbols that don't contain rust as substring for executables

For staticlib we still keep checking symbols that don't contain rust as
substring.

Author: bjorn3

tests/run-make/symbols-all-mangled/rmake.rs

@@ -59,6 +59,13 @@ fn symbols_check(path: &str) {
             continue; // Correctly mangled
         }
 
+        if !name.contains("rust") {
+            // Assume that this symbol doesn't originate from rustc. This may
+            // be wrong, but even if so symbol_check_archive will likely
+            // catch it.
+            continue;
+        }
+
         if name == "__rust_no_alloc_shim_is_unstable" {
             continue; // FIXME remove exception once we mangle this symbol
         }
@@ -67,14 +74,6 @@ fn symbols_check(path: &str) {
             continue; // Unfortunately LLVM doesn't allow us to mangle this symbol
         }
 
-        if ["_start", "__dso_handle", "_init", "_fini", "__TMC_END__"].contains(&name) {
-            continue; // Part of the libc crt object
-        }
-
-        if name == "main" {
-            continue; // The main symbol has to be unmangled for the crt object to find it
-        }
-
         panic!("Unmangled symbol found: {name}");
     }
 }