[Win32] Overload ==, != for locale_t and long long

[pirama]

Summary

_is_chartype_l (needed for isxdigit_l) in MinGW compares locale_t and NULL.
NULL is 'long long' for 64-bit, and this results in ambiguous overloads when
compiled with Clang. Define a concrete overload for the operators to fix the
ambiguity.

include/support/win32/locale_win32.h

public:
     friend bool operator==(const locale_t& __left, const locale_t& __right) {
         return __left.__locale == __right.__locale;
     }
 
     friend bool operator==(const locale_t& __left, int __right) {
         return __left.__locale == nullptr && __right == 0;
     }
 
+    friend bool operator==(const locale_t& __left, long long __right) {
+        return __left.__locale == nullptr && __right == 0;
+    }
+
     friend bool operator==(const locale_t& __left, std::nullptr_t) {
         return __left.__locale == nullptr;
     }
 
     friend bool operator==(int __left, const locale_t& __right) {
         return __left == 0 && nullptr == __right.__locale;
     }
 
     friend bool operator==(std::nullptr_t, const locale_t& __right) {
         return nullptr == __right.__locale;
     }
 
     friend bool operator!=(const locale_t& __left, const locale_t& __right) {
         return !(__left == __right);
     }
 
     friend bool operator!=(const locale_t& __left, int __right) {
         return !(__left == __right);
     }
 
+    friend bool operator!=(const locale_t& __left, long long __right) {
+        return !(__left == __right);
+    }
+
     friend bool operator!=(const locale_t& __left, std::nullptr_t __right) {
         return !(__left == __right);
     }
 
     friend bool operator!=(int __left, const locale_t& __right) {
         return !(__left == __right);
     }