fixup! fixup! Visual Studio: Enable all warnings other than deprecation and make them errors

Author: tautschnig

src/config.inc

@@ -20,6 +20,8 @@ ifeq ($(BUILD_ENV),MSVC)
   CXXFLAGS += /wd4127
   # disable warning "behavior change ... called instead of ..."
   CXXFLAGS += /wd4350
+  # disable warning "assignment operator could not be generated"
+  CXXFLAGS += /wd4512
 else
   CXXFLAGS += -Wall -pedantic -Werror -Wno-deprecated-declarations
 endif