[ELF] Don't ignore --detect-odr-violations

We don't implement the gold specific feature and it's inappropriate to ignore it.
The option is used by some projects under gold configure checks.

Author: MaskRay

lld/ELF/Options.td

@@ -698,7 +698,6 @@ def: J<"plugin-opt=-pass-through=">;
 def plugin_opt_eq : J<"plugin-opt=">;
 
 // Options listed below are silently ignored for now for compatibility.
-def: F<"detect-odr-violations">;
 def: Flag<["-"], "d">;
 def: Flag<["-"], "g">;
 def: F<"long-plt">;

lld/test/ELF/silent-ignore.test

@@ -1,6 +1,5 @@
 RUN: ld.lld --version \
 RUN:   -d \
-RUN:   -detect-odr-violations \
 RUN:   -g \
 RUN:   -long-plt \
 RUN:   --no-add-needed \