[llvm-lib] Pass the right value of MingwDef to parseCOFFModuleDefinition

In llvm-lib cases, the MinGW specific behaviours shouldn't be
enabled.

Not adding any tests to check the corner case behaviours, as this
simply was a mistake when this codepath was added in
395ec44 / D144765.

Differential Revision: https://reviews.llvm.org/D152362

llvm/lib/ToolDrivers/llvm-lib/LibDriver.cpp

@@ -384,7 +384,7 @@ int llvm::libDriverMain(ArrayRef<const char *> ArgsArr) {
     }
 
     Expected<COFFModuleDefinition> Def =
-        parseCOFFModuleDefinition(*MB, LibMachine, true);
+        parseCOFFModuleDefinition(*MB, LibMachine, /*MingwDef=*/false);
 
     if (!Def) {
       llvm::errs() << "error parsing definition\n"